#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = (a >= b ? a : b)
#define chmin(a, b) a = (a <= b ? a : b)
#define out(a) cout << a << endl
#define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)
#define abs(x) (x >= 0 ? x : -(x))
#define ceil(a, b) a / b + !!(a % b)
#define FIX(a) fixed << setprecision(a)

int main() {
    int n;
    cin >> n;
    int a[10001] = {0};
    rep(i, n) {
        string str;
        cin >> str;
        a[SZ(str) - 2]++;
    }
    pii b = {0, 0};
    rep(i, 1001) {
        if (b.F <= a[i]) {
            b.F = a[i];
            b.S = i;
        }
    }
    out(b.S);
}