#include <bits/stdc++.h>

using namespace std;

using int64 = long long;


int main() {
  int N;
  cin >> N;
  map< int, int > mp;
  for(int i = 0; i < N; i++) {
    string x;
    cin >> x;
    mp[x.size() - 2]++;
  }
  int ret = 0;
  for(auto &p : mp) ret = max(ret, p.second);
  vector< int > last;
  for(auto &p : mp) {
    if(ret == p.second) last.emplace_back(p.first);
  }
  cout << last.back() << endl;
}