import std.stdio;
import std.conv;
import std.string;
import std.typecons;
import std.algorithm;
import std.array;
import std.range;
import std.math;
import std.regex : regex;
import std.container;
import std.bigint;
import std.numeric;


void main()
{
  int sx, sy, tx, ty;
  readf("%s %s %s %s\n", &sx, &sy, &tx, &ty);
  string f1_res, f2_res, r1_res, r2_res;
  f1_res = f2_res = r1_res, r2_res = "";

  string x1, x2, y1, y2;

  x1 = "R";
  x2 = "L";

  y1 = "U";
  y2 = "D";

  f2_res ~= y2 ~ x1;
  r2_res ~= y1 ~ x2;

  foreach (i; 0..tx-sx) {
    f1_res ~= x1;
    r1_res ~= x2;
  }

  foreach (i; 0..ty-sy) {
    f1_res ~= y1;
    r1_res ~= y2;
  }

  f2_res ~= f1_res ~ y1 ~ x2;
  r2_res ~= r1_res ~ y2 ~ x1;

  writeln(f1_res ~ r1_res ~ f2_res ~ r2_res);
}
