console.log((args=>{
  const [sx,sy,tx,ty] = args.trim().split` `.map(v=>0|v);
  const p1 = 'U'.repeat(ty-sy) + 'R'.repeat(tx-sx);
  const p2 = 'D'.repeat(ty-sy) + 'L'.repeat(tx-sx);
  const p3 = 'LU' + p1 + 'RD';
  const p4 = 'RD' + p2 + 'LU';
  return p1+p2+p3+p4;
})(require('fs').readFileSync('/dev/stdin', 'utf8')));
