#include<iostream>
#include <string>
#define N 10000

using namespace std;

int main(void){
	int n, index;
	int a[N]={};
	cin >> n;
	string s;
	for(int i=0;i<n;i++){
		cin >> s;
		a[s.size()-2]++;
	}
	index = 0;
	for(int i=1;i<N;i++){
		if(a[index] <= a[i]){
			index = i;
		}
	}
	cout << index << "\n";
}