import java.io.*;
import java.util.*;


public class Main_yukicoder706 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int n = sc.nextInt();

		int[] cnt = new int[1000 + 1];
		for (int i = 0; i < n; i++) {
			String s = sc.next();
			
			cnt[s.length()]++;
		}

		int max = 0;
		int maxi = 0;
		for (int i = 0; i <= 1000; i++) {
			if (cnt[i] >= max) {
				max = cnt[i];
				maxi = i;
			}
		}
		
		pr.println(maxi - 2);
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(INPUT == null ? System.in : new ByteArrayInputStream(INPUT.getBytes()));
		pr = new Printer(System.out);

		solve();

//		pr.close();
		pr.flush();
//		sc.close();
	}

	static String INPUT = null;

	private static class Printer extends PrintWriter {
		Printer(OutputStream out) {
			super(out);
		}
	}
}