#include <bits/stdc++.h>

using namespace std;

string printNextMove(int &i_start, int &j_start, int &i_end, int &j_end) {
    int h_diff = j_start - j_end;
    int v_diff = i_start - i_end;
    string s = "";
    //cout<<h_diff<<" "<<v_diff<<endl;
    if ((v_diff > 1) && (h_diff > 0)) {
        s = "UL ";
        i_start -= 2;
        j_start -= 1;
    } else if ((v_diff > 1) && (h_diff < 0)) {
        s = "UR ";
        i_start -= 2 ;
        j_start += 1;
    } else if ((v_diff == 0) && (h_diff < 0)) {
        s = "R ";
        j_start += 2;
    } else if ((v_diff < -1) && (h_diff < 0)) {
        s = "LR ";
        j_start += 1;
        i_start += 2;
    } else if ((v_diff < -1) && (h_diff > 0)) {
        s = "LL ";
        i_start += 2;
        j_start -= 1;
    } else if ((v_diff < -1) && (h_diff == 0)) {
        s = "LR ";
        j_start += 1;
        i_start += 2;
    } else if ((v_diff > 1) && (h_diff == 0)) {
        s = "UL ";
        i_start -= 2;
        j_start -= 1;
    } else {
        s = "L ";
        j_start -= 2;
    }
    return s;
}

void printShortestPath(int n, int i_start, int j_start, int i_end, int j_end) {
    int h_diff = abs(j_start - j_end);
    int v_diff = abs(i_start - i_end);
    if ((((v_diff)%2) != 0) || ((v_diff) == 0) && (((h_diff)%2) != 0)
       || ((v_diff) == (h_diff)) || (((h_diff + (v_diff/2))%2) != 0)) {
        cout<<"Impossible"<<endl;
        return;
    }
    int moves = 0;
    string s = "";
    while ((j_start != j_end) || (i_start != i_end)) {
        //cout<<"vals: "<< i_start <<" "<<j_start<<" "<<i_end<<" "<<j_end<<endl;
        s += printNextMove(i_start, j_start, i_end, j_end);
        moves++;
    }
    cout<<moves<<endl;
    cout<<s.c_str()<<endl;
}

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;
}