#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>
#include <ctype.h>
using namespace std;

//#include<bits/stdc++.h>

int main() {
	int n;
	cin >> n;
	int a[1005] = {};
	for (int i = 0; i < n; i++) {
		string p;
		cin >> p;
		a[p.size()]++;
		
	}
	int t = 0,y=0;
	for (int i = 0; i <= 1002; i++) {
		if (t <= a[i]) {
			t = a[i];
			y = i-2;
		}
	}
	cout << y << endl;

	return 0;
}