#include <bits/stdc++.h>
using namespace std;

#define ll long long 
#define lll __int128
#define INF 0x3f3f3f3f
#define LNF 0x3f3f3f3f3f3f3f3fll
#define MOD 998244353
#define pii pair<int, int>
#define pdd pair<double, double>

#define N 5050

ll n, d;

int main() {
#ifdef TEST
    freopen("zz.in", "r+", stdin);
#endif
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    string s; cin >> s;
    int t = 0, d = 0;

    for (int i = 0; i < 5; ++ i) {
        t += s[i] == 'T';
        d += s[i] == 'D';
        if (t >= 3 || d >= 3) break;
    }

    cout << (t >= 3 ? "T1" : "DRX") << '\n';
}