package MapsLambdaStreamExercise;

import java.math.BigInteger;
import java.util.*;
import java.util.stream.Collectors;

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

        String[] inputArr = scanner.nextLine().split("\\s+");
        int maxNum = 0;

        for (int i = 0; i < inputArr.length; i++) {
            int counter = 0;
            String currentWord = inputArr[i];
            for (int j = 0; j < currentWord.length(); j++) {
                int currentSymbol = currentWord.charAt(j);
                if (i == inputArr.length - 1 && j == currentWord.length() - 1) {
                    break;
                }
                if (currentSymbol >= 48 && currentSymbol <= 57
                        || currentSymbol >= 65 && currentSymbol <= 90
                        || currentSymbol >= 97 && currentSymbol <= 122) {
                } else {
                    counter++;
                }

            }
            if (counter > maxNum) {
                maxNum = counter;
            }
        }
        System.out.println(maxNum);

    }
}