题解 | #统计字符#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        System.out.println(str.replaceAll("[^A-Za-z]","").length());
        System.out.println(str.replaceAll("[^\\s]","").length());
        System.out.println(str.replaceAll("[^0-9]","").length());
        System.out.print(str.replaceAll("[\\s]|[0-9]|[A-Za-z]","").length());
    }
}