题解 | #统计字符#

import java.util.*;
import java.util.regex.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    String line = in.nextLine();
    
    // regex
    int countLetter = line.length() - line.replaceAll("[a-zA-Z]", "").length();
    int countSpace = line.length() - line.replaceAll(" ", "").length();
    int countDigital = line.length() - line.replaceAll("\\d+", "").length();


    System.out.println(countLetter);
    System.out.println(countSpace);
    System.out.println(countDigital);
    System.out.println(line.length() - countDigital - countLetter - countSpace);

  }
}