import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int [] num = new int [1001];
        int max = 0;
        for(int i = 0; i < n; i++) {
            String s = sc.next();
            int l = s.length()-2;
            num[l]++;
            max = Math.max(max, num[l]);
        }
        for(int j = num.length-1; j>=0; j--) {
            if(num[j] == max) {
                System.out.println(j);
                break;
            }
        }
    }
}