#include <bits/stdc++.h>
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define fore(i, a) for(auto &i:a)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
#define yes "YES"
#define no "NO"
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;

int main() {
    fastcin;
    int n, ans = 0, tmp = 0;
    cin >> n;
    string s;
    map<int, int> m;
    rep(i, 0, n) {
        cin >> s;
        int l = s.length()-2;
        m[l]++;
    }
    fore(i, m) {
        if(i.second>tmp) {
            ans = i.first;
            tmp = i.second;
        } else if(i.second==tmp) {
            if(i.first>ans) {
                ans = i.first;
                tmp = i.second;
            }
        }
    }
    cout << ans << endl;
    return 0;
}