ElectronicMessage

import java.util.Scanner;

public class Task2ElectronicMessage {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] input = scanner.nextLine().split(" ");
        int counter;
        int max = 0;
        for (int i = 0; i < input.length; i++) {
            char[] charArr = input[i].toCharArray();
            counter = 0;
            for (char ch : charArr) {
                if (ch == '.') {
                    break;
                }
                boolean isALetterOrDigit = Character.isLetterOrDigit(ch);
                if (!isALetterOrDigit) {
                    counter++;
                    if (max < counter) {
                        max = counter;
                    }
                } else {
                    counter = 0;
                }
            }
        }
        System.out.println(max);
    }
}