#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <cmath>
#include <stack>
#include <queue>
#include <functional>
#include <set>
#include <map>
#include <tuple>
#include <bitset>
#include <random>
#define REP(i,n) for(int i=0;i<n;i++)
#define INF 1000000007
using namespace std;
using pii=pair<int,int>;



int main() {
  int sx,sy,tx,ty;
  cin>>sx>>sy>>tx>>ty;
  int dx=tx-sx,dy=ty-sy;
  string ans="";
  string right(dx,'R'),left(dx,'L'),up(dy,'U'),down(dy,'D');
  ans=ans+up+right+down+left+'L'+up+'U'+'R'+right+'D'+'R'+down+'D'+'L'+left+'U';
  cout<<ans<<endl;

  return 0;
}
#include <algorithm>
#include <bitset>
#include <tuple>
#include <cstdint>
#include <cstdio>
#include <cctype>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <limits>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define ArraySizeOf(array)     (sizeof(array) / sizeof(array[0]))
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define REP(i,n) for(int i=1;i<n;i++)
#define rev(i,n) for(int i=n-1;i>=0;i--)
#define _GLIBCXX_DEBUG
int INF = 1e9+7;
unsigned NthDayOfWeekToDay(unsigned n, unsigned dow, unsigned dow1)
{
unsigned day;
if(dow < dow1) dow += 7;
day = dow - dow1;
day += 7 * n - 6;
return day;
}
unsigned DayToWeekNumber(unsigned day)
{
  return (day - 1) / 7 + 1;
}
unsigned AnotherDayOfWeek(unsigned day, unsigned day0, unsigned dow0)
{
  return (dow0 + 35 + day - day0) % 7;
}
using namespace std;
signed main(){
  int a,b,c,d; cin>>a>>b>>c>>d;
  rep(i,c-a)cout<<"R";
  rep(i,d-b)cout<<"U";
  rep(i,c-a)cout<<"L";
  rep(i,d-b)cout<<"D";
  cout<<"L";
  rep(i,d-b+1)cout<<"U";
  rep(i,c-a+1)cout<<"R";
  cout<<"D"<<"R";
  rep(i,d-b+1)cout<<"D";
  rep(i,c-a+1)cout<<"L";
  cout<<"U"<<endl;
}