c_051.cpp

#include<bits/stdc++.h>
using namespace std;

int main(){
  int sx,sy,tx,ty;
  cin>>sx>>sy>>tx>>ty;
  int x=tx-sx;
  int y=ty-sy;
  for(int i=0;i<x;++i)cout<<"R";
  for(int i=0;i<y;++i)cout<<"U";
  for(int i=0;i<x;++i)cout<<"L";
  for(int i=0;i<y;++i)cout<<"D";
  cout<<"D";
  for(int i=0;i<x+1;++i)cout<<"R";
  for(int i=0;i<y+1;++i)cout<<"U";
  cout<<"L"<<"U";
  for(int i=0;i<x+1;++i)cout<<"L";
  for(int i=0;i<y+1;++i)cout<<"D";
  cout<<"R"<<endl;
}