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

void scan(T...)(ref T a) {
    string[] ss = readln.split;
    foreach (i, t; T) a[i] = ss[i].to!t;
}
T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

void calc(int sx, int sy, int tx, int ty) {

    void adv(char c, int step) { c.repeat(step).write; }
    void U(int step) { adv('U', step); }
    void D(int step) { adv('D', step); }
    void L(int step) { adv('L', step); }
    void R(int step) { adv('R', step); }

    int dx = tx - sx;
    int dy = ty - sy;

    R(dx);
    U(dy);
    L(dx);
    D(dy);

    D(1);
    R(dx + 1);
    U(dy + 1);
    L(1);
    U(1);
    L(dx + 1);
    D(dy + 1);
    R(1);

    writeln();
}

void main() {
    int sx, sy, tx, ty; scan(sx, sy, tx, ty);
    calc(sx, sy, tx, ty);
}
