process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function printShortestPath(n, i_start, j_start, i_end, j_end) {
    //  Print the distance along with the sequence of moves.
  var i_current = i_start;
  var j_current = j_start;
  var counter = 0;
  var seq = '';
  // var seq2 = String(i_start) + ',' + String(j_start);
  
  while (i_current !== i_end || j_current !== j_end) {
    if (counter >= 10) break;
    var moved_ij = UL(i_current, j_current, n, i_end, j_end);
    if (moved_ij.moved) {
      i_current = moved_ij.i_new;
      j_current = moved_ij.j_new;
      seq = seq + 'UL ';
      counter++;
      // seq2 = seq2 + ' => ' + String(i_current) + ',' + String(j_current);
    } else {
      moved_ij = UR(i_current, j_current, n, i_end, j_end);
      if (moved_ij.moved) {
        i_current = moved_ij.i_new;
        j_current = moved_ij.j_new;
        seq = seq + 'UR ';
        counter++;
        // seq2 = seq2 + ' => ' + String(i_current) + ',' + String(j_current);
      } else {
        moved_ij = R(i_current, j_current, n, i_end, j_end);
        if (moved_ij.moved) {
          i_current = moved_ij.i_new;
          j_current = moved_ij.j_new;
          seq = seq + 'R ';
          counter++;
          // seq2 = seq2 + ' => ' + String(i_current) + ',' + String(j_current);
        } else {
          moved_ij = LR(i_current, j_current, n, i_end, j_end);
          if (moved_ij.moved) {
            i_current = moved_ij.i_new;
            j_current = moved_ij.j_new;
            seq = seq + 'LR ';
            counter++;
            // seq2 = seq2 + ' => ' + String(i_current) + ',' + String(j_current);
          } else {
            moved_ij = LL(i_current, j_current, n, i_end, j_end);
            if (moved_ij.moved) {
              i_current = moved_ij.i_new;
              j_current = moved_ij.j_new;
              seq = seq + 'LL ';
              counter++;
              // seq2 = seq2 + ' => ' + String(i_current) + ',' + String(j_current);
            } else {
              moved_ij = L(i_current, j_current, n, i_end, j_end);
              if (moved_ij.moved) {
                i_current = moved_ij.i_new;
                j_current = moved_ij.j_new;
                seq = seq + 'L ';
                counter++;
                // seq2 = seq2 + ' => ' + String(i_current) + ',' + String(j_current);
              } else {
                break;
              }
            }
          }
        }
      }
    }
  }
  if(i_current === i_end && j_current === j_end)
     process.stdout.write(counter + '\n' + seq /* + '\n' + seq2 */ );
  else process.stdout.write('Impossible')
}

function UL(i_current, j_current, n, i_end, j_end) {
  if (i_current - 2 < 0 || j_current - 1 < 0) 
    return {moved: false, i_new : i_current, j_new : j_current};
  if ((i_current - i_end) <= 0 || (j_current - j_end) <= 0) 
    return {moved: false, i_new : i_current, j_new : j_current};
  return {moved: true, i_new : i_current - 2 , j_new : j_current - 1};
}

function UR(i_current, j_current, n, i_end, j_end) {
  if (i_current - 2 < 0 || j_current + 1 >= n)
    return {moved: false, i_new : i_current, j_new : j_current};
  if ((i_current - i_end) <= 0 || (j_current - j_end) > 0) 
    return {moved: false, i_new : i_current, j_new : j_current};
  return {moved: true, i_new : i_current - 2, j_new : j_current + 1};
}

function R(i_current, j_current, n, i_end, j_end) {
  if (j_current + 2 >= n)
    return {moved: false, i_new : i_current, j_new : j_current};
  if ((j_current - j_end) >= -1)
    return {moved: false, i_new : i_current, j_new : j_current};
  return {moved: true, i_new : i_current, j_new : j_current + 2};
}

function LR(i_current, j_current, n, i_end, j_end) {
  if (i_current + 2 >= n || j_current + 1 >= n)
    return {moved: false, i_new : i_current, j_new : j_current};
  if ((i_current - i_end) >= 0 || (j_current - j_end) > 0)
    return {moved: false, i_new : i_current, j_new : j_current};
  return {moved: true, i_new : i_current + 2 , j_new : j_current + 1};
}

function LL(i_current, j_current, n, i_end, j_end) {
  if (i_current + 2 >= n || j_current - 1 < 0) 
    return {moved: false, i_new : i_current, j_new : j_current};
  if ((i_current - i_end) >= 0 || (j_current - j_end) < 0) 
    return {moved: false, i_new : i_current, j_new : j_current};
  return {moved: true, i_new : i_current + 2 , j_new : j_current - 1};
}

function L(i_current, j_current, n, i_end, j_end) {
  if (j_current - 2 < 0)
    return {moved: false, i_new : i_current, j_new : j_current};
  if ((j_current - j_end) <= 1)
    return {moved: false, i_new : i_current, j_new : j_current};
  return {moved: true, i_new : i_current , j_new : j_current - 2};
}

function main() {
    var n = parseInt(readLine());
    var i_start_temp = readLine().split(' ');
    var i_start = parseInt(i_start_temp[0]);
    var j_start = parseInt(i_start_temp[1]);
    var i_end = parseInt(i_start_temp[2]);
    var j_end = parseInt(i_start_temp[3]);
    printShortestPath(n, i_start, j_start, i_end, j_end);

}