#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
int MOD = 1000000007;
int main(){
    int sx,sy,tx,ty;
    cin >> sx >> sy >> tx >> ty;
    cout << string(tx-sx,'R') << string(ty-sy,'U');
    cout << string(tx-sx,'L') << string(ty-sy,'D');
    cout << "D" << string(tx-sx+1,'R') << string(ty-sy+1,'U') << "L";
    cout << "U" << string(tx-sx+1,'L') << string(ty-sy+1,'D') << "R" << endl;;
}