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 ////////////////////

// order of priority: UL, UR, R, LR, LL, L
function nextMove(n, i_start, j_start, i_end, j_end) {
    const horizontalDiff = j_start - j_end;
    const horizontalAbs = Math.abs(horizontalDiff);
    const verticalDiff = i_start - i_end;
    const verticalAbs = Math.abs(verticalDiff);
  
    if ((verticalAbs === 0 && horizontalAbs % 2 !== 0) || verticalAbs % 2 !== 0) {
        return null;
    }
  
    if (horizontalAbs <= 2 && verticalAbs <= 2 && !((verticalAbs === 0 && horizontalAbs === 2) || (verticalAbs === 2 && horizontalAbs === 1))) {
      return null;
    }
  
    let action = '';
    let i = i_start;
    let j = j_start;
  
    if (verticalDiff > 0) {
      action += 'U';
      i -= 2;
      
      if (i < 0) {
         return null;
      }
    } else if (verticalDiff < 0) {
      action += 'L';
      i += 2;
      
      if (i >= n) {
         return null;
      }
    }
  
    
    const horizontalIncrement = i === i_start ? 2 : 1;

    if (horizontalDiff < 0) {
      action += 'R';
      j += horizontalIncrement;
      
      if (j >= n) {
         return null;
      }
    } else if (horizontalDiff > 0) {
      action += 'L';
      j -= horizontalIncrement;
      
      if (j < 0) {
         return null;
      }
    } else if (i > i_start) { // move downwards      
      if ((j + horizontalIncrement) < n) { // can move to the right
        action += 'R';
        j += horizontalIncrement;
      } else {
        action += 'L';
        j -= horizontalIncrement;
      }
    } else { // move upwards 
      if ((j - horizontalIncrement) >= 0) { // can move to the left
        action += 'L';
        j -= horizontalIncrement;
      } else {
        action += 'R';
        j += horizontalIncrement;
      }
    }
  
  
    return {i, j, action};
}

// order of priority: UL, UR, R, LR, LL, L
const priorities = ['UL', 'UR', 'R', 'LR', 'LL', 'L'];

function sortMoves(moves) {
  return moves.sort((a, b) => priorities.indexOf(a) - priorities.indexOf(b));
}

function printShortestPath(n, i_start, j_start, i_end, j_end) {
    const moves = [];
    let move = nextMove(n, i_start, j_start, i_end, j_end);
    
    while (move !== null) {
      moves.push(move.action);
 
      if (move.i === i_end && move.j === j_end) {
        break;
      }
      
      move = nextMove(n, move.i, move.j, i_end, j_end);
    }
    
    if (!move) {
       return console.log('Impossible');
    }
    
    console.log(moves.length);
    console.log(sortMoves(moves).join(' '));
}

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);

}