process.stdin.resume();
process.stdin.setEncoding('utf8');

process.stdin.on('data', function (chunk) {
	var numbers = chunk.toString().split(' ');
	var sx = parseInt(numbers[0]);
	var sy = parseInt(numbers[1]);
	var tx = parseInt(numbers[2]);
	var ty = parseInt(numbers[3]);
	
	var A = tx - sx;
	var B = ty - sy;

	function concatN (c, N) {
		var ret = "";
		for (var i=0; i < N; i++)
		    ret = ret + c;
		return ret;
	}
	
	var ans = concatN("R", A);
	ans = ans + concatN("U",B);
	
	ans = ans + concatN("L",A);
	ans = ans + concatN("D",B);
	
	ans = ans + "D" + concatN("R",A+1);
	ans = ans + concatN("U",B+1) + "L";
	
	ans = ans + "U" + concatN("L",A+1);
	ans = ans + concatN("D",B+1) + "R";
	
	console.log(ans);
	
	process.exit();
});