#include<iostream>
using namespace std;
#define r(n) for(int i=0;i<(n);i++)
#define p(a) cout<<a
int main(){int a,b,c,d;cin>>a>>b>>c>>d;c-=a;d-=b;r(d)p("U");r(c)p("R");r(d)p("D");c++;d++;r(c)p("L");r(d)p("U");r(c)p("R");p("DR");r(d)p("D");r(c)p("L");p("U");}