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

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] sl = new int[1000];
        for(int i=0; i<n; i++) {
            String s = in.next();
            sl[s.length() - 2]++;
        }

        int max = 0, maxcount = 0;
        for(int i=0; i<1000; i++) {
            if(max <= sl[i]) {
                max = sl[i];
                maxcount = i;
            }
        }

        System.out.println(maxcount);
    }
}