ElectronicMessage

import java.util.Scanner;

public class ElectronicMessage {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        String [] input = scan.nextLine().split(" ");
        int counter = 0;
        int tempCounter = 0;
        String allWords = "";

        for (int i = 0; i < input.length; i++) {
            allWords = input[i];

            String specialCharactersString = "!@#$%^&*()_+-=><?";
            for (int k = 0; k < allWords.length(); k++) {
                char ch = allWords.charAt(k);
                if (specialCharactersString.contains(Character.toString(ch))) {
                    tempCounter++;
                }
                if ((Character.toString(ch)).matches(".*[a-zA-Z].*") ||
                        (Character.toString(ch)).matches(".*[0-9].*")) {
                    if (counter < tempCounter) {
                        counter = tempCounter;
                    }
                    tempCounter = 0;
                }
            }
            if (counter < tempCounter) {
                counter = tempCounter;
            }
            tempCounter = 0;
        }
        System.out.println(counter);




    }
}