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

int main() {
	int N;
	cin >> N;
	int COUNT[1000] = {};
	for(int i = 0; i < N; i++) {
		string S;
		cin >> S;
		COUNT[S.size() - 2]++;
	}
	int MAX = -1;
	for (int i = 0; i < 1000; i++) MAX = max(MAX, COUNT[i]);
	for (int i = 999; i >= 0; i--) {
		if (COUNT[i] == MAX) {
			cout << i << endl;
			return 0;
		}
	}
}