题解 | #字符串字符匹配#

import java.util.*;

public class Main{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        char [] str = sc.nextLine().toCharArray();
        int [] num = new int[4];
        for(char x : str){
            if(('A' <=x && x<='Z') || ('a' <=x && x<='z')){
                num[0]++;
            }else if(x == ' '){
                num[1]++;
            }else if('0' <=x && x<='9'){
                num[2]++;
            }else{
                num[3]++;
            }
        }
        for(int x : num){
            System.out.println(x);
        }
    }
}