#include<bits/stdc++.h>
#include <atcoder/all>
#ifdef LOCAL
#include <debug_print.hpp>
#define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (static_cast<void>(0))
#endif
using namespace atcoder;
using mint=modint1000000007;
using namespace std;
using ll=long long;
using ul=unsigned long long;
int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1};
int dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};
using Graph=vector<vector<int>>;
ll op(ll a,ll b){return max(a,b);}
ll e(){return 0;}
int main(){
    int N;
    cin>>N;
    map<string,int>mp;
    for(int i=0;i<N;i++){
        string S;
        cin>>S;
        mp[S]++;
    }
    int m=0;
    string M="";
    for(auto[k,v]:mp){
        if(m<v)m=v,M=k;
        else if(m==v){
            if(M.size()<k.size())M=k;
        }
    }
    cout<<M.size()-2<<endl;
}