题解 | 不要三句号的歪

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 line = in.nextLine();
        String[] arr = line.split(",...,");
        long end = Long.parseLong(arr[1]);

        String[] arr1 = arr[0].split(",");
        long start = Long.parseLong(arr1[arr1.length - 1]);

        System.out.println(end - start - 1);
    }
}