#include<iostream>
#include<string>
using namespace std;
int main(){
    int sx,sy,tx,ty;
    cin >> sx >> sy >> tx >> ty;
    int dx=tx-sx,dy=ty-sy;
    cout << string(dy,'U') << string(dx,'R');
    cout << string(dy,'D') << string(dx,'L');
    cout << 'L' << string(dy+1,'U') << string(dx+1,'R') << 'D';
    cout << 'R' << string(dy+1,'D') << string(dx+1,'L') << 'U';
    cout << endl;
    return 0;
}