import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int []d = new int[1001 - 2];
		Arrays.fill(d, 0);
		for(int i = 0; i < N; i++) {
			String s = scan.next();
			d[s.length() - 2] ++;
		}
		scan.close();
		int max = 0;
		int index = 0;
		for(int i = 0; i < d.length; i++) {
			if(max <= d[i]) {
				index = i;
				max = d[i];
			}
		}
		System.out.println(index);
	}
}