#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int N;
map<int, int> mp;

int main() {
  cin >> N;
  for (int i = 0; i < N; i++) {
    string S; cin >> S;
    mp[S.size() - 2]++;
  }
  int ans = 0, ma = 0;
  for (auto p: mp) {
    if (ma <= p.second) {
      ma = p.second;
      ans = p.first;
    }
  }
  cout << ans << endl;
  return 0;
}