PAT乙级java 1018答案错误

package PAT;

import java.util.Objects;
import java.util.Scanner;

public class B1018 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        int winCa = 0;
        int winJa = 0;
        int winBa = 0;
        int winCb = 0;
        int winJb = 0;
        int winBb = 0;
        int draw = 0;
        for (int i = 0; i < 10; i++) {
            String a = scanner.next();
            String b = scanner.next();
            if (Objects.equals(a, b)) draw++;
            else if (Objects.equals(a, "C")) {
                if (Objects.equals(b, "J")) winCa++;
                if (Objects.equals(b, "B")) winBb++;
            } else if (Objects.equals(a, "J")) {
                if (Objects.equals(b, "B")) winJa++;
                if (Objects.equals(b, "C")) winCb++;
            } else if (Objects.equals(a, "B")) {
                if (Objects.equals(b, "C")) winBa++;
                if (Objects.equals(b, "J")) winJb++;
            }
        }
        System.out.println(winBa + winCa + winJa + " " + draw + " " + (winBb + winCb + winJb));
        System.out.println(winBb + winCb + winJb + " " + draw + " " + (winBa + winCa + winJa));
        if (winJa > winCa && winJa > winBa) {
            System.out.print("J");
        } else if (winCa > winBa) {
            System.out.print("C");
        } else {
            System.out.print("B");
        }
        System.out.print(" ");
        if (winJb > winCb && winJb > winBb) {
            System.out.print("J");
        } else if (winCb > winBb) {
            System.out.print("C");
        } else {
            System.out.print("B");
        }
    }
}

上述代码能完美运行PAT给的测试用例，我自己改了几组也能完美实现。
但一到提交的时候就全部答案错误（不是运行超时）。
我自己自查之后依然找不到问题。
希望能解决问题。