#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n, x1, x2, y1, y2;
    cin >> n >> y1 >> x1 >> y2 >> x2;
    if ((y2 - y1) % 2) {
        cout << "Impossible\n";
    } else {
        string ans = "";
        int cnt = 0;
        if (x1 == x2) {
            if (y1 > y2) {
                while (y1 >= y2) {
                    ans += "UL ";
                    y1 -= 2;
                    x1--;
                    cnt++;
                    if (y1 > y2) {
                        ans += "UR ";
                        y1 -= 2;
                        x1++;
                        cnt++;
                    }
                }
                if (x1 != x2) {
                    cout << "Impossible\n";
                } else {
                    cout << cnt << "\n" << ans << endl;
                }
            } else {
                while (y1 < y2) {
                    ans += "LR ";
                    y1 += 2;
                    x1++;
                    cnt++;
                    if (y1 < y2) {
                        ans += "LL ";
                        y1 += 2;
                        x1--;
                        cnt++;
                    }
                }
                if (x1 != x2) {
                    cout << "Impossible\n";
                } else {
                    cout << cnt << "\n" << ans << endl;
                }
            }
        } else if (y1 >= y2 && x1 >= x2) {
            while (y1 > y2) {
                ans += "UL ";
                y1 -= 2;
                x1--;
                cnt++;
            }
            while (x1 > x2) {
                ans += "L ";
                x1 -= 2;
                cnt++;
            }
            if (x1 < x2) {
                cout << "Impossible\n";
            } else {
                cout << cnt << "\n" << ans << endl;
            }
        } else if (y1 >= y2 && x1 < x2) {
            while (y1 > y2) {
                ans += "UR ";
                y1 -= 2;
                x1--;
                cnt++;
            }
            while (x1 < x2) {
                ans += "R ";
                x1 += 2;
                cnt++;
            }
            if (x1 > x2) {
                cout << "Impossible\n";
            } else {
                cout << cnt << "\n" << ans << endl;
            }
        } else if (y1 < y2 && x1 >= x2) {
            while (y1 < y2) {
                ans += "LL ";
                y1 += 2;
                x1++;
                cnt++;
            }
            while (x1 > x2) {
                ans += "L ";
                x1 -= 2;
                cnt++;
            }
            if (x1 < x2) {
                cout << "Impossible\n";
            } else {
                cout << cnt << "\n" << ans << endl;
            }
        } else {
            while (y1 < y2) {
                ans += "UR ";
                y1 += 2;
                x1++;
                cnt++;
            }
            while (x1 < x2) {
                ans += "R ";
                x1 += 2;
                cnt++;
            }
            if (x1 > x2) {
                cout << "Impossible\n";
            } else {
                cout << cnt << "\n" << ans << endl;
            }
        }
    }
    return 0;
}