题解 | #计算某字符出现次数#

import java.util.Scanner;

// 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 sc = new Scanner(System.in);
        String str1 = sc.nextLine();
        String str2 = sc.nextLine();

        int length = str1.length();
        String str3 = str1.toUpperCase().replaceAll(str2.toUpperCase(),"");
        int count = str1.length()-str3.length();
        System.out.println(count);
    }

    }