题解 | #计算某字符出现次数# 字符替换

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 in = new Scanner(System.in);
        String first = in.nextLine();
        String upf = first.toUpperCase();
        String second = in.nextLine();
        String ups= second.toUpperCase();
        String res = upf.replaceAll(ups, "");

        System.out.println(upf.length()-res.length());
    }
}