import java.io.FileNotFoundException;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws FileNotFoundException {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] cnt = new int[10000][2];
		for (int i = 0; i < cnt.length; ++i) {
			cnt[i][0] = i;
		}
		for (int i = 0; i < N; ++i) {
			cnt[sc.next().length() - 2][1]++;
		}
		Arrays.sort(cnt, new Comparator<int[]>() {
			@Override
			public int compare(int[] o1, int[] o2) {
				if (o1[1] != o2[1])
					return -Integer.compare(o1[1], o2[1]);
				else
					return -Integer.compare(o1[0], o2[0]);
			}
		});
		System.out.println(cnt[0][0]);
	}

	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

}