#include <array>
#include <string>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
	int N;
	cin >> N;
	
	string str;
	array<int, 1000> cnt{ 0 };
	for (int i = 0; i < N; ++i)
	{
		cin >> str;
		cnt.at(str.size() - 2)++;
	}

	int v = 0;
	int r = 0;

	for (int i = 0; i < cnt.size(); ++i)
	{
		if (v <= cnt.at(i))
		{
			v = cnt.at(i);
			r = i;
		}
	}

	cout << r << endl;

	return 0;
}