#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#define pb push_back
using namespace std;

int parse(string a) {
    if (a == "UL")
        return 1;
    if (a == "UR")
        return 2;
    if (a == "R")
        return 3;
    if (a == "LR")
        return 4;
    if (a == "LL")
        return 5;
    if (a == "L")
        return 6;
    return 7;
}

bool comp(string a, string b) {
    return parse(b) > parse(a);
}

int main() {
    ios_base::sync_with_stdio(0);
    int n, x1, y1, x2, y2;
    cin >> n >> x1 >> y1 >> x2 >> y2;
    
    int height = abs(x1 - x2), width = abs(y1 - y2);
    bool isPossible = true;
    vector<string> result;

    if (width % 2 == 0) {
        if (height % 4 != 0)
            isPossible = false;
    } else
        if (abs(height + 2) % 4 != 0)
            isPossible = false;
    
    if (isPossible) {
        int counter = 0;

        while(x1 != x2 || y1 != y2) {
            ++counter;
            
            if (x1 != x2) {
                if (x2 < x1) {
                    if (y2 <= y1) {
                        result.pb("UL");
                        x1 -= 2;
                        y1 -= 1;
                    } else {
                        result.pb("UR");
                        x1 -= 2;
                        y1 += 1;
                    }
                } else {
                    if (y2 >= y1) {
                        result.pb("LR");
                        x1 += 2;
                        y1 += 1;
                    } else {
                        result.pb("LL");
                        x1 += 2;
                        y1 -= 1;
                    }
                }
            } else if (y2 > y1) {
                result.pb("R");
                y1 += 2;
            } else {
                result.pb("L");
                y1 -= 2;
            }
        }
        cout << counter << "\n";
        sort(result.begin(), result.end(), comp);
        for (auto i : result)
            cout << i << " ";
        cout << "\n";
    } else {
        cout << "Impossible\n";
    }
    
    return 0;
}