#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    int N;
    cin >> N;

    map<int, int> mp;
    rep(i, N) {
        string s;
        cin >> s;
        mp[int(s.size()) - 2]++;
    }

    int ans = 0;
    int ma = 0;
    for (auto p : mp) {
        if (p.second >= ma) {
            ma = p.second;
            ans = p.first;
        }
    }

    cout << ans << endl;

    return 0;
}