
#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<cmath>
#include<string>
#define N 6009
using namespace std;
const int INF = 0x3f3f3f3f;
typedef long long LL;

int main()
{
    int sx, sy, tx, ty;
    scanf("%d%d%d%d", &sx, &sy, &tx, &ty);
    for(int i = sy + 1; i <= ty; i++) printf("U");
    for(int i = sx + 1; i <= tx; i++) printf("R");
    for(int i = ty - 1; i >= sy; i--) printf("D");
    for(int i = tx - 1; i >= sx; i--) printf("L");
    printf("L");
    for(int i = sy; i <= ty; i++) printf("U");
    for(int i = sx; i <= tx; i++) printf("R");
    printf("DR");
    for(int i = ty; i >= sy; i--) printf("D");
    for(int i = tx; i >= sx; i--) printf("L");
    printf("U\n");
    return 0;
}