import java.util.*;

public class Main {
	public static void main (String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		TreeMap<Integer, Integer> map = new TreeMap<>();
		for (int i = 0; i < n; i++) {
		    int x = sc.next().length();
		    if (map.containsKey(x)) {
		        map.put(x, map.get(x) + 1);
		    } else {
		        map.put(x, 1);
		    }
		}
		int max = 0;
		int maxIdx = 0;
		for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
		    if (entry.getValue() >= max) {
		        max = entry.getValue();
		        maxIdx = entry.getKey();
		    }
		}
		System.out.println(maxIdx - 2);
	}
}