void main()
{
    long[] tmp = readln.split.to!(long[]);
    long sx = tmp[0], sy = tmp[1];
    long tx = tmp[2], ty = tmp[3];

    auto s1 = 'U'.repeat(ty-sy);
    auto s2 = 'R'.repeat(tx-sx);
    auto s3 = 'D'.repeat(ty-sy);
    auto s4 = 'L'.repeat(tx-sx);

    auto s5 = 'U'.repeat(ty-sy+1);
    auto s6 = 'R'.repeat(tx-sx+1);
    auto s7 = 'D'.repeat(ty-sy+1);
    auto s8 = 'L'.repeat(tx-sx+1);

    writeln(s1, s2, s3, s4, 'L', s5, s6, 'D', 'R', s7, s8, 'U');
}

import std.stdio;
import std.string;
import std.array;
import std.conv;
import std.algorithm;
import std.range;
import std.math;
import std.numeric;
import std.container;
import std.typecons;
import std.ascii;
import std.uni;