1012题这题有坑，我错了三次

送分题

public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str=sc.nextLine();
        int a=0,b=0,c=0,d=0;
        for (int i = 0; i < str.length(); i++) {
            char ch=str.charAt(i);
            if(ch>='a'&&ch<='z'||ch>='A'&&ch<='Z')a++;
            else if(ch>='0'&&ch<='9')b++;
            else if(ch==' ')c++;
            else d++;
        }
        System.out.println(a+" "+b+" "+c+" "+d);
    }