import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] counts = new int[1000];
        for (int i = 0; i < n; i++) {
            counts[sc.next().length() - 2]++;
        }
        int max = 0;
        int idx = 0;
        for (int i = 0; i < counts.length; i++) {
            if (max <= counts[i]) {
                max = counts[i];
                idx = i;
            }
        }
        System.out.println(idx);
    }
}