#include <iostream>
#include <string>

using namespace std;

int N;
string S[1000];
int lens[1000];

int main() {
    cin >> N;
    int max_freq = 0;
    int result_len = 0;
    for (int i = 0; i < N; i++) {
        cin >> S[i];
    }
    for (int i = 0; i < N; i++) {
        lens[S[i].length() - 2] += 1;
    }
    for (int i = 0; i < 1000; i++) {
        if (max_freq <= lens[i]) {
            result_len = i;
            max_freq = lens[i];
        }
    }
    cout << result_len << endl;
}