'use strict';

function Main(INPUT) {
    const input = INPUT.split("\n")[0].split(" ");
    const sx = input[0];
    const sy = input[1];
    const tx = input[2];
    const ty = input[3];
    let ans = "";

    for (let i = 0; i < ty - sy; i++) {
        ans += "U";
    }
    for (let i = 0; i < tx - sx; i++) {
        ans += "R";
    }
    for (let i = 0; i < ty - sy; i++) {
        ans += "D";
    }
    for (let i = 0; i <= tx - sx; i++) {
        ans += "L";
    }

    for (let i = 0; i <= ty - sy; i++) {
        ans += "U";
    }
    for (let i = 0; i <= tx - sx; i++) {
        ans += "R";
    }
    ans += "DR"
    for (let i = 0; i <= ty - sy; i++) {
        ans += "D";
    }
    for (let i = 0; i <= tx - sx; i++) {
        ans += "L";
    }
    ans += "U";

    console.log(ans);
}

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