#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define rep(i,l,r) for(int i=(l);i<(r);i++)
#define fcout cout << fixed << setprecision(10)
int main(){
    int n;
    vector<int>a(1000);
    cin>>n;
    string s;
    rep(i,0,n){
        cin>>s;
        a.at(s.size()-2)++;
    }
    int mx=0,ans;
    rep(i,0,1000)if(a.at(i)>=mx){
        mx=a.at(i);
        ans=i;
    }
    cout<<ans;
}