#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;

	map<size_t, int> m;
	for (int i = 0; i < n; ++i)
	{
		string s;
		cin >> s;
		++m[s.size() - 2];
	}

	auto it = max_element(m.begin(), m.end(),
		[](const pair<unsigned, int>& p1, const pair<unsigned, int>& p2)
	{
		return (p1.second < p2.second) ||
			((p1.second == p2.second) && (p1.first < p2.first));
	});

	cout << it->first << "\n";

	return 0;
}