#include <iostream>
#include <string>
#include <vector>
#include <map>
using namespace std;
int main(){
	int N;
	cin >> N;
	vector<string> S(N);
	for (int i = 0; i < N; i++){
		cin >> S[i];
	}
	map<int, int> mp;
	for (int i = 0; i < N; i++){
		mp[S[i].size() - 2]++;
	}
	int mx = 0;
	int ans = 0;
	for (auto P : mp){
		if (P.second >= mx){
			mx = P.second;
			ans = P.first;
		}
	}
	cout << ans << endl;
}