#include<iostream>
using namespace std;


void pri(int y,char c){
  for(int i=0;i<y;i++)
    cout<<c;
}

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

  int x = tx-sx;
  int y = ty-sy;

  pri(y,'U');
  pri(x,'R');
  pri(y,'D');
  pri(x+1,'L');
  pri(y+1,'U');
  pri(x+1,'R');
  cout<<'D';
  cout<<'R';
  pri(y+1,'D');
  pri(x+1,'L');
  cout<<'U'<<endl;

  return 0;
}