#include<bits/stdc++.h>
using namespace std;


int main(){
	int sx,sy,gx,gy,dx,dy;
	cin >> sx >> sy >> gx >> gy;
	
	dx=gx-sx;
	dy=gy-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;
}
