#include <bits/stdc++.h>

using namespace std;

int main() {
  int N;
  scanf("%d", &N);

  map<int, int> cnts;

  for (int i = 0; i < N; ++i) {
    string S;
    cin >> S;
    int cnt = S.size() - 2;
    cnts[cnt]++;
  }

  int ma = -1;
  int cnt = -1;
  for (auto e: cnts) {
    if (e.second >= ma) {
      ma = e.second;
      cnt = e.first;
    }
  }

  printf("%d\n", cnt);
  return 0;
}