Electronic Message

import java.util.Scanner;

public class ElectronicMessage {
    public static void main(String[] args) {
        Scanner myScan = new Scanner(System.in);
        char[] letters = myScan.nextLine().toCharArray();
        int countMax = 0;
        int counter = 0;
        for (int i = 0; i < letters.length-1; i++) {
            if (letters[i]!=32&&!Character.isLetterOrDigit(letters[i])) {
                counter++;
            } else {
                counter = 0;
            }
            if (counter >= countMax) {
                countMax = counter;
            }
        }
            System.out.print(countMax);
    }
}