#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> PII;
typedef unsigned long long ull;

void solve() {
    string s;
    cin >> s;
    int t = 0, d = 0;
    for(int i = 0; i < s.size(); i++) {
        if(s[i] == 'T') t += 1;
        if(s[i] == 'D') t += 1;
        if(t == 3) {
            cout << "T1";
            return ;
        }
        if(d == 3) {
            cout << "DRX";
            return ;
        }
    }
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
   
    int t = 1;
    //cin >> t;

    while(t--) solve();


    return 0;
}