#include<bits/stdc++.h>
#define int long long
#define x first
#define y second

using namespace std;
typedef pair<int, int> pii;
const int N = 2e5 + 10;

void solve() {
    string s;
    cin >> s;

    int ds = 0, ts = 0;
    int flag = 0;
    for (auto& it : s) {
        if (it == 'T') ts++;
        else if (it == 'D') ds++;
        if (!flag) {
            if (ts > 2) flag = 1;
            if (ds > 2) flag = 2;
        }
    }

    if (flag == 1) cout << "T1\n";
    else cout << "DRX\n";
}
signed main() {
    int _ = 1;
    //cin >> _;
    while (_--) {
        solve();
    }
    return 0;
}