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


int main() {
    int n, istart, jstart, iend, jend;
    cin>>n;
    cin>>istart>>jstart>>iend>>jend;
    vector<vector<int> >matrix(n, vector<int>(n));
    if((istart-iend)%2==1 || (istart-iend)%2==-1) {
        cout<<"Impossible";
    }
    else {
        if(((jend-jstart)-((iend-istart)/2))%2==1 || ((jend-jstart)-((iend-istart)/2))%2==-1) {
            cout<<"Impossible";
        }
        else {
            int curri = istart;
            int currj = jstart;
            int count = 0;
            string s = "";
            while(curri!=iend || currj!=jend) {
                // UL
                if(curri-2>=0 && currj-1>=0 && iend<curri && jend<currj) {
                    curri = curri - 2;
                    currj = currj - 1;
                    s.append("UL ");
                }
                // UR
                else if(curri-2>=0 && currj+1<n && iend<=curri && jend>=currj) {
                    curri = curri - 2;
                    currj = currj + 1;
                    s.append("UR ");
                }
                // R
                else if(currj+2<n && jend>currj && iend==curri) {
                    currj = currj + 2;
                    s.append("R ");
                }
                // LR
                else if(curri+2<n && currj+1<n && iend>curri && jend>=currj) {
                    curri = curri + 2;
                    currj = currj + 1;
                    s.append("LR ");
                }
                // LL
                else if(curri+2<n && currj-1>=0 && iend>curri && jend<=currj) {
                    curri = curri + 2;
                    currj = currj - 1;
                    s.append("LL ");
                }
                // L
                else if(currj-2>=0 && jend<currj && iend==curri){
                    currj = currj - 2;
                    s.append("L ");
                }
                count++;
            }
            cout<<count<<endl;
            cout<<s;
        }
    }
    return 0;
}