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

auto rdsp(){return readln.splitter;}
void pick(R,T)(ref R r,ref T t){t=r.front.to!T;r.popFront;}
void readV(T...)(ref T t){auto r=rdsp;foreach(ref v;t)pick(r,v);}

void main()
{
  int sx, sy, tx, ty; readV(sx, sy, tx, ty);

  auto x = tx-sx, y = ty-sy;
  auto w(dchar c, int l) { write(c.repeat.take(l)); }

  w('U', y);
  w('R', x);
  w('D', y);
  w('L', x);

  w('L', 1);
  w('U', y+1);
  w('R', x+1);
  w('D', 1);

  w('R', 1);
  w('D', y+1);
  w('L', x+1);
  w('U', 1);
}
