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

int main() {
	int sx, sy, tx, ty;
	cin >> sx >> sy >> tx >> ty;

	int dx = tx - sx;
	int 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';
}
