/**
 *    author:  tourist
 *    created: 14.12.2017 19:14:29       
**/
#include <bits/stdc++.h>

using namespace std;

int n;

int build(int xa, int ya, int xb, int yb) {
  if (xa < 0 || ya < 0 || xa >= n || ya >= n) {
    return 42424242;
  }
  vector<string> res;
  while (xa != xb) {
    if (xa > xb) {
      if (ya > yb) {
        res.push_back("UL");
        ya--;
      } else {
        res.push_back("UR");
        ya++;
      }
      xa -= 2;
    } else {
      if (ya > yb) {
        res.push_back("LL");
        ya--;
      } else {
        res.push_back("LR");
        ya++;
      }
      xa += 2;
    }
  }
  while (ya > yb) {
    res.push_back("L");
    ya -= 2;
  }
  while (ya < yb) {
    res.push_back("R");
    ya += 2;
  }
  assert(xa == xb && ya == yb);
  int sz = (int) res.size();
  return sz;
}

int main() {
  scanf("%d", &n);
  int xa, ya, xb, yb;
  scanf("%d %d %d %d", &xa, &ya, &xb, &yb);
  if (xa % 2 != xb % 2 || (ya + abs(xa - xb) / 2) % 2 != yb % 2) {
    cout << "Impossible" << endl;
    return 0;
  }
  vector<string> res;
  while (xa != xb || ya != yb) {
    int cur = build(xa, ya, xb, yb);
    if (build(xa - 2, ya - 1, xb, yb) + 1 == cur) {
      res.push_back("UL");
      xa -= 2;
      ya -= 1;
      continue;
    }
    if (build(xa - 2, ya + 1, xb, yb) + 1 == cur) {
      res.push_back("UR");
      xa -= 2;
      ya += 1;
      continue;
    }
    if (build(xa, ya + 2, xb, yb) + 1 == cur) {
      res.push_back("R");
      ya += 2;
      continue;
    }
    if (build(xa + 2, ya + 1, xb, yb) + 1 == cur) {
      res.push_back("LR");
      xa += 2;
      ya += 1;
      continue;
    }
    if (build(xa + 2, ya - 1, xb, yb) + 1 == cur) {
      res.push_back("LL");
      xa += 2;
      ya -= 1;
      continue;
    }
    if (build(xa, ya - 2, xb, yb) + 1 == cur) {
      res.push_back("L");
      ya -= 2;
      continue;
    }
    assert(false);
  }
  assert(xa == xb && ya == yb);
  int sz = (int) res.size();
  printf("%d\n", sz);
  for (int i = 0; i < sz; i++) {
    if (i > 0) {
      printf(" ");
    }
    printf("%s", res[i].c_str());
  }
  printf("\n");
  return 0;
}