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

int main(void) {
  ll N;
  cin >> N;
  vector<string> S(N);
  REP(i, 0, N) cin >> S[i];

  map<ll, ll> cnt;
  REP(i, 0, N) cnt[S[i].length() - 2]++;

  ll x = 0, ans;
  for(auto p : cnt) {
    if(x <= p.second) {
      x = p.second;
      ans = p.first;
    }
  }
  cout << ans << endl;
}