#include<bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

ll C[2000];

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll N;
    cin >> N;

    while(N--){
        string s; cin >> s;
        ll eye = s.size()-2;
        C[eye]++;
    }

    ll ma = 0;
    for(ll c : C){
        chmax(ma, c);
    }

    for(int i=2000-1; i>=0; i--){
        if(C[i]==ma){
            p(i);
            return 0;
        }
    }
    
    return 0;
}