#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    int y1, x1, y2, x2;
    cin >> y1 >> x1 >> y2 >> x2;
    if ((abs(y2 - y1) & 1) ||
        (abs(y2 - y1) % 4 == 0 && (abs(x2 - x1) & 1)) ||
        (abs(y2 - y1) % 4 != 0 && !(abs(x2 - x1) & 1))) {
        cout << "Impossible" << endl;
        return 0;
    }
    vector<string> res;
    while (y1 != y2 || x1 != x2) {
        if (y1 > y2) {
            y1 -= 2;
            if (x1 > x2) {
                res.push_back("UL");
                --x1;
            } else {
                res.push_back("UR");
                ++x1;
            }
        } else if (y1 < y2) {
            y1 += 2;
            if (x1 > x2) {
                res.push_back("LL");
                --x1;
            } else {
                res.push_back("LR");
                ++x1;
            }
        } else {
            if (x1 > x2) {
                res.push_back("L");
                x1 -= 2;
            } else {
                res.push_back("R");
                x1 += 2;
            }
        }
    }
    cout << res.size() << endl;
    for (auto s : res)
        printf("%s ", s.c_str());
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}