#include <bits/stdc++.h>
 
using namespace std;
#define ll long long
#define rep(i,m,n) for (ll i=m;i<=n;i++)
#define reb(i,m,n) for (ll i=m;i>=n;i--)
#define rv(i,vt) for (auto i:vt)
#define pb push_back
#define ii pair<ll,ll>
#define F first
#define S second
#define sz(v) (int)v.size()
#define iii tuple<ll,ll,ll>
const ll N=1e6+5,mod=1e9+7;
void prep(){
}
void solve()
{
    string s;
    cin>>s;
    ll t=0,d=0;
    rep(i,0,4) if (s[i]=='T') t++;
    else d++;
    if (t>=3) cout<<"T1";
    else cout<<"DRX";
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll tests=1;
    //cin>>tests;
    prep();
    while (tests--){
        solve();
        //cout<<endl;
    }
}