#include <bits/stdc++.h>
#ifdef __LOCAL
    #define DBG(X) cout << #X << " = " << (X) << endl;
    #define SAY(X) cout << (X) << endl;
    #include <filesystem>
    namespace fs = std::filesystem;
#else
    #define DBG(X)
    #define SAY(X)
#endif

using namespace std;

using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

int dx[]={1, 0, -1, 0, 1,-1, 1,-1};
int dy[]={0, 1, 0, -1, 1, 1,-1,-1};
const int INT_INF = (int)(2e9);
const ll  LL_INF = (ll)(2e18);
static mt19937 _g(time(nullptr));
 
inline ll randint(ll a, ll b) { ll w = (_g() << 31LL) ^ _g(); return a + w % (b - a + 1); }
inline void fast_io() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); };
template<typename T, typename S> inline ostream& operator<<(ostream& os, const pair<T, S> p) { cout << "[" << p.first << ";" << p.second << "]"; return os; }
template<typename T, typename S> inline ostream& operator<<(ostream& os, const map<T, S> p) { for (auto el : p) cout << "[" << el.first << ";" << el.second << "]"; return os; }
template<typename T> inline ostream& operator<<(ostream& os, const vector<T>& v) { for (auto el : v) cout << el << " "; return os; }
template<typename T> inline vector<T> fetch_vec(int sz) { vector<T> ret(sz); for (auto& elem : ret) cin >> elem; return ret; }

int sx,sy,tx,ty;
void input(){
    fast_io();
    #ifdef __LOCAL
        fs::path __p = __FILE__;
        fs::path __input, __output;
        __input = __output = __p.parent_path();
        __input += string("/input/") + string(__p.stem()) + string(".txt");
        __output += string("/output/") + string(__p.stem()) + string(".txt");
        freopen(__input.c_str(), "r", stdin);
        freopen(__output.c_str(), "w", stdout);
    #endif
    cin >> sx >> sy >> tx >> ty;
}

string conv(vector<pii> vec){
    string ret;
    for(auto p:vec){
        if(p.first>0  && p.second==0) ret+=string(abs(p.first),'R');
        if(p.first<0  && p.second==0) ret+=string(abs(p.first),'L');
        if(p.first==0 && p.second>0 ) ret+=string(abs(p.second),'U');
        if(p.first==0 && p.second<0 ) ret+=string(abs(p.second),'D');
    }
    return ret;
}

string line(int x,int y,int z,int w,bool rev=false, bool rot=false){
    if(y==w) return line(y,x,w,z,rev=rev,rot=!rot);
    if(x>z) return line(z,w,x,y,rev=!rev,rot=rot);
    vector<pii> res;
    // 1
    res.emplace_back(z-x,0);
    // 2
    res.emplace_back(0,-1);
    res.emplace_back(x-z,0);
    res.emplace_back(0,1);
    // 3
    res.emplace_back(0,1);
    res.emplace_back(z-x,0);
    res.emplace_back(0,-1);
    // 4
    res.emplace_back(1,0);
    res.emplace_back(0,-2);
    res.emplace_back(x-z-2,0);
    res.emplace_back(0,2);
    res.emplace_back(1,0);

    if(rev){
        for(auto &r:res) {r.first*=-1;r.second*=-1;}
    }

    if(rot){
        for(auto &r:res) {swap(r.first,r.second);}
    }

    string ret = conv(res);
    return ret;
}

string circle(int x,int y,int z,int w,int rot=0){
    if(!(x<z && y<w)) return circle(-y,x,-w,z,++rot);

    vector<pii> res;
    // 1
    res.emplace_back(z-x,0);
    res.emplace_back(0,w-y);
    // 2
    res.emplace_back(-z+x,0);
    res.emplace_back(0,-w+y);
    // 3
    res.emplace_back(0,-1);
    res.emplace_back(z-x+1,0);
    res.emplace_back(0,w-y+1);
    res.emplace_back(-1,0);
    // 4
    res.emplace_back(0,1);
    res.emplace_back(-z+x-1,0);
    res.emplace_back(0,-w+y-1);
    res.emplace_back(1,0);

    while(rot--){
        for(auto& r:res) {swap(r.first,r.second); r.second*=-1;}
    }
    string ret = conv(res);
    return ret;
}

int solve(){
    string ans;
    if(sx==tx || sy==ty) ans = line(sx,sy,tx,ty);
    else ans = circle(sx,sy,tx,ty);
    cout << ans << endl;
    return 0;
}   

int main()
{
    input();
    solve();
    return 0;
}


Measured memory_bytes: 256