#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair< ll, ll > Pi;
#define rep(i,n) for(int i=0;i<(n);i++)
#define rep2(i,n) for(int i=1;i<=(n);i++)
#define rep3(i,i0,n) for(int i=i0;i<(n);i++)
#define pb push_back
#define mod 1000000007
const ll INF = 1LL << 60;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
ll gcd(ll a, ll b) {return b?gcd(b,a%b):a;}
ll lcm(ll a, ll b) {return a/gcd(a,b)*b;}
#define all(x) x.begin(), x.end()
#define mp make_pair
bool compare(Pi a, Pi b) {
    if(a.first != b.first){
        return a.first < b.first;
        
    }else{
        return a.second < b.second;
    }
}


bool In_map(ll y,ll x,ll h,ll w){
    if(y<0 || x<0 || y>=h || x>=w){
        return 0;
    }else{
        return 1;
    }
}
const vector<ll> dx{1,0,-1,0};
const vector<ll> dy{0,1,0,-1};


int main() {
    ll sx,sy,tx,ty;
    cin >>sx>>sy>>tx>>ty;
    rep(i,tx-sx){
        cout<<'R';
    }
    rep(i,ty-sy){
        cout<<'U';
    }
    rep(i,tx-sx){
        cout<<'L';
    }
    rep(i,ty-sy){
        cout<<'D';
    }
    cout<<'D';

    rep(i,tx-sx+1){
        cout<<'R';
    }

    rep(i,ty-sy+1){
        cout<<'U';
    }
    cout<<'L';
    cout<<'U';
    rep(i,tx-sx+1){
        cout<<'L';
    }
    rep(i,ty-sy+1){
        cout<<'D';
    }
    cout<<'R';
    cout  << endl;


    return 0;
    

}
#include "bits/stdc++.h"
using namespace std;

// Inserted snippets: io, root
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
template<typename H> bool chmin(H& v1, const H v2) { if (v1 > v2) { v1 = v2; return true; } return false; }
template<typename H> bool chmax(H& v1, const H v2) { if (v1 < v2) { v1 = v2; return true; } return false; }
template<typename H> void read(H& head) { cin >> head; }
template<typename H, typename ...T> void read(H& head, T& ...tail) { cin >> head; read(tail...); }
template<typename H> void write(H head) { cout << head << '\n'; }
template<typename H, typename ...T> void write(H head, T ...tail) { cout << head << " "; write(tail...); }
template<typename ...T> void die(T ...tok) { write(tok...); exit(0); }
// End snippets

int main() {
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);

  int sx, sy, tx, ty;
  read(sx, sy, tx, ty);
  int dx = tx - sx, dy = ty - sy;
  write(
      "L" +
      string(dy + 1, 'U') +
      string(dx + 1, 'R') +
      "D" +
      "R" +
      string(dy + 1, 'D') +
      string(dx + 1, 'L') +
      "U" +
      string(dy, 'U') +
      string(dx, 'R') +
      string(dy, 'D') +
      string(dx, 'L')
      );
}
