1
2 2
1 1
1 2
 1
1 3
3
1 2 3
 1
1 1
1000
1000
 1
2 2
2 2
2 2
 5
4 5
10 8 6 4
1 2 3 4 5
1 1
3
3
1 1
3
2
5 3
1000 2 2 2 3
3 1 5
5 5
1 2 3 4 5
1 2 3 4 5
 1
4 4
1 1 1 1
1 2 3 4
 1
2 3
1 1
1 2 3

YES
1 1
 YES
1 3
 YES
1 1000
 YES
1 2
 YES
1 4
YES
1 3
NO
YES
1 3
YES
1 1
 YES
1 1
 YES
1 1

if __name__ == "__main__":
    T = int(input())
    for t in range(T):
        N, M = list(map(int, input().split()))
        A = list(map(int, input().split()))
        B = list(map(int, input().split()))
        found = False
        ans = 0
        for a in A:
            for b in B:
                if a == b:
                    found = True
                    ans = a
                    break
            if found:
                break
        if found:
            print("YES")
            print("1 ", ans)
        else:
            print("NO")

