import java.util.Scanner;

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


        String bord = scanner.nextLine();
        int first = 0;
        int sec = 0;

       String bord1 = bord.replace(" ", "");
        for (int i = 0; i < bord1.length() - 1; i++) {

            if(Character.isLetter(bord1.charAt(i)) || Character.isDigit(bord1.charAt(i))){
                first = 0;
            }else {
                first = first + 1 ;


            }
            if (first > sec ){
                sec = first;
            }
        }


        System.out.println(sec);

    }
}