#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <climits>

//#define int long long
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(a) (a).begin(), (a).end()
#define SZ(a) (signed)((a).size())
#define EACH(i, c) for (typeof((c).begin()) i = (c).begin(); i != (c).end(); ++i)
#define EXIST(s, e) ((s).find(e) != (s).end())
#define SORT(c) sort((c).begin(), (c).end())

using namespace std;

typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;

const int MOD = 1000000007;

#define dump(x) cerr << #x << " = " << (x);
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")"  << " " << __FILE__;

signed main(void) {
    ios::sync_with_stdio(false);
    cout.setf(ios::fixed, ios::floatfield);
    cout.precision(10);
    cin.tie(0);

    int sx,sy,tx,ty;
    cin >> sx >> sy >> tx >> ty;
    if(sx<tx){
        if(sy<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";
        }else{
            REP(i,tx-sx){
                cout << "R";
            }
            REP(i,sy-ty){
                cout << "D";
            }
            REP(i,tx-sx){
                cout << "L";
            }
            REP(i,sy-ty){
                cout << "U";
            }

            cout << "U";
            REP(i,tx-sx+1){
                cout << "R";
            }
            REP(i,sy-ty+1){
                cout << "D";
            }
            cout << "L";
            cout << "D";
            REP(i,tx-sx+1){
                cout << "L";
            }
            REP(i,sy-ty+1){
                cout << "U";
            }
            cout << "R";
        }
    }else{
        if(sy<ty){
            REP(i,sx-tx){
                cout << "L";
            }
            REP(i,ty-sy){
                cout << "U";
            }
            REP(i,sx-tx){
                cout << "R";
            }
            REP(i,ty-sy){
                cout << "D";
            }

            cout << "D";
            REP(i,sx-tx+1){
                cout << "L";
            }
            REP(i,ty-sy+1){
                cout << "U";
            }
            cout << "R";
            cout << "U";
            REP(i,sx-tx+1){
                cout << "R";
            }
            REP(i,ty-sy+1){
                cout << "D";
            }
            cout << "L";
        }else{
            REP(i,sx-tx){
                cout << "L";
            }
            REP(i,sy-ty){
                cout << "D";
            }
            REP(i,sx-tx){
                cout << "R";
            }
            REP(i,sy-ty){
                cout << "U";
            }

            cout << "U";
            REP(i,sx-tx+1){
                cout << "L";
            }
            REP(i,sy-ty+1){
                cout << "D";
            }
            cout << "R";
            cout << "D";
            REP(i,sx-tx+1){
                cout << "R";
            }
            REP(i,sy-ty+1){
                cout << "U";
            }
            cout << "L";
        }
    }
    cout << endl;
    
    return 0;
}


Measured memory_bytes: 888