#include <bits/stdc++.h>

using namespace std;

void printShortestPath(int n, int i_start, int j_start, int i_end, int j_end) {
    //  Print the distance along with the sequence of moves.
    int x = j_end - j_start;
    int y = i_start - i_end;
    if(x == 0){
        if(abs(y)%4 == 0){
            cout << abs(y)/2 << endl;
            if(y > 0){
                int UL = y/4;
                int UR = y/4;
                while(UL > 0 || UR > 0){
                    if(j_start == 0 || UL == 0) {cout << "UR "; UR--; j_start++;}
                    else {cout << "UL ";UL--;j_start--;}
                }
            }else{
                int UL = abs(y)/4;
                int UR = abs(y)/4;
                while(UL > 0 || UR > 0){
                    if(j_start == n - 1 || UL == 0) {cout << "LL "; UR--; j_start--;}
                    else {cout << "LR ";UL--;j_start++;}
                }
            }
        }else{
            cout << "Impossible" << endl;
        }
    }else if(y == 0){
        if(abs(x)%2 == 0){
            cout << abs(x)/2 << endl;
            if(x > 0){
                int R = abs(x)/2;
                while(R){cout << "R ";R--;}
            }else{
                int R = abs(x)/2;
                while(R){cout << "L ";R--;}
            }
        }else{
            cout << "Impossible" << endl;
        }
    }else{
        int ay = abs(y); int ax = abs(x);
        if(ay&1){
            cout << "Impossible" << endl;
            return;
        }
        if((ay/2 + ax)&1){
            cout << "Impossible" << endl;
            return;
        }
        int V = ay/2;
        if(ax >= V){
            int H = (ax - V)/2;
            cout << V+H << endl;
            if(x > 0 && y > 0){
                while(V--)cout << "UR ";
                while(H--)cout << "R ";
            }else if(x < 0 && y > 0){
                while(V--)cout << "UL ";
                while(H--)cout << "L ";
            }else if(x > 0 && y < 0){
                while(H--)cout << "R ";
                while(V--)cout << "LR ";
            }else{
                while(V--)cout << "LL ";
                while(H--)cout << "L ";
            }
        }else{       
            cout << ay/2 << endl;
            if(x > 0 && y > 0){
                int UR = (ax + ay/2)/2; 
                int UL = (ay/2 - ax)/2;    
                while(UL > 0 || UR > 0){
                    if(j_start == 0 || UL == 0) {cout << "UR "; UR--; j_start++;}
                    else {cout << "UL ";UL--;j_start--;}
                }
            }else if(x < 0 && y > 0){
                int UL = (ax + ay/2)/2; 
                int UR = (ay/2 - ax)/2;   
                while(UL > 0 || UR > 0){
                    if(j_start == 0 || UL == 0) {cout << "UR "; UR--; j_start++;}
                    else {cout << "UL ";UL--;j_start--;}
                }
            }else if(x > 0 && y < 0){
                int UL = (ax + ay/2)/2; 
                int UR = (ay/2 - ax)/2;   
                while(UL > 0 || UR > 0){
                    if(j_start == 0 || UL == 0) {cout << "LL "; UR--; j_start--;}
                    else {cout << "LR ";UL--;j_start++;}
                }
            }else{
                int UR = (ax + ay/2)/2; 
                int UL = (ay/2 - ax)/2; 
                while(UL > 0 || UR > 0){ 
                    if(j_start == 0 || UL == 0) {cout << "LL "; UR--; j_start++;}
                    else {cout << "LR ";UL--;j_start--;}
                }
            }
        }
    }
    return;
}

int main() {
    int n;
    cin >> n;
    int i_start;
    int j_start;
    int i_end;
    int j_end;
    cin >> i_start >> j_start >> i_end >> j_end;
    printShortestPath(n, i_start, j_start, i_end, j_end);
    return 0;
}