#include <iostream>
#include <vector>
#include <algorithm>
#include <map>

using namespace std;
using ll = long long;

const int mod = 1e9 + 7;

int main(){
    int n;
    cin >> n;
    map<string , int> cnt;
    for(int i = 0; i < n; i++){
        string s;
        cin >> s;
        cnt[s]++;
    }
    int mx = -1;
    string anss;
    for(auto i : cnt){
       if(mx < i.second){
           mx = i.second;
           anss = i.first;
       }else if(mx == i.second){
           if(anss.size() < i.first.size()){
               anss = i.first;
           }
       }
    }
    //cout << anss << endl;
    int ans = anss.size() - 2;
    cout << ans << endl;
    return 0;
}