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

t = int(input())  # take the size
while t:
    t -= 1
    n, m = input().split()
    # m = int(input())
    # print(f"")
    a = input().split()
    b = input().split()
    # a = [int(input()) for _ in range(n)]
    # b = [int(input()) for _ in range(m)]

    y = False
    for x in a:
        if x in b:
            print("YES")
            print(1, x)
            y = True
            break

    if not y:
        print("NO")