#include <bits/stdc++.h>
using namespace std;
int main () {
    int sx, sy, tx, ty;
    cin >> sx >> sy >> tx >> ty;
    int x = tx-sx, y = ty-sy;
    cout << string(y, 'U') << string(x, 'R') << string(y, 'D') << string(x, 'L') << "D" << string(x+1, 'R') << string(y+1, 'U') << "LU" << string(x+1, 'L') << string(y+1, 'D') << 'R' << endl;
}