function myout(text){console.log(text);}//standard output
function Main(input) {
	//input = parseInt(input);
	//input = input.split(" ");
	//input = input.split("\n");
	input = input.split(" ").map((a)=>Number(a));
	//input = input.split("\n").map((a)=>Number(a));
  var x = input[2] - input[0];
  var y = input[3] - input[1];
  var output = "";
  for(var i = 0; i < y; i++){
    output += "U";
  }
  for(var i = 0; i < x+1; i++){
    output += "R";
  }
  for(var i = 0; i < y+1; i++){
    output += "D";
  }
  for(var i = 0; i < x+1; i++){
    output += "L";
  }
  output += "UL";
  for(var i = 0; i < y+1; i++){
    output += "U";
  }
  for(var i = 0; i < x+1; i++){
    output += "R";
  }
  for(var i = 0; i < y+1; i++){
    output += "D";
  }
  for(var i = 0; i < x; i++){
    output += "L";
  }
  myout(output);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8").trim());