#include <bits/stdc++.h>
using namespace std;
// yukicoder no.706

int main() {
    vector<int> freq(1000, 0);
    int N;
    cin >> N;
    while (N--){
        string S;
        cin >> S;
        ++freq[S.size() - 2];
    }
    int ans = 0;
    int maxFreq = 0;
    for (int i = 0; i < freq.size(); ++i){
        if (maxFreq <= freq[i]){
            ans = i;
            maxFreq = freq[i];
        }
    }
    cout << ans << endl;
    return 0;
}