#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define endl '\n'
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define rep2(i,a,b) for(int i=int(a);i<int(b);i++)
#define pb emplace_back
#define all(x) (x).begin(),(x).end()
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;

signed main(){
	ll n;
	while(1){
		bool f=false;
		cin>>n;
		if(n==0)break;
		vector<ll> a(26,0);
		rep(i,n){
			char c;
			cin>>c;
			ll b=(c-'A');
			if(f)continue;
			a[b]++;
			rep(j,26){
				bool x=true;
				rep(k,26){
					if(j!=k&&a[j]<=a[k]+(n-i-1))x=false;
				}
				if(x){
					char aa='A'+j;
					cout<<aa<<" "<<i+1<<endl;
					f=true;
				}
				if(f)break;
			}
		}
		//rep(i,26)cout<<a[i]<<" ";
		//cout<<endl;
		if(!f)cout<<"TIE"<<endl;
	}
}

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