#include <bits/stdc++.h>
using namespace std;
int main() {
  int x1, y1, x2, y2, i;
  int a, b;
  cin >> x1 >> y1 >> x2 >> y2;
  a = abs(y2 - y1);
  b = abs(x2 - x1);
  for (i = 0; i < a; i++) cout << "U";
  for (i = 0; i < b; i++) cout << "R";
  for (i = 0; i < a; i++) cout << "D";
  for (i = 0; i < b + 1; i++) cout << "L";
  for (i = 0; i < a + 1; i++) cout << "U";
  for (i = 0; i < b + 1; i++) cout << "R";
  cout << "D";
  cout << "R";
  for (i = 0; i < a + 1; i++) cout << "D";
  for (i = 0; i < b + 1; i++) cout << "L";
  cout << "U";
  cout << endl;
  return 0;
}
