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

def sub_sequence_numbers(n, m, list_an, list_am):
    if n <= m:
        for i in list_an:
            if i in list_am:
                print("YES")
                print(1, i)
                break
    elif m < n:
        for j in list_am:
            if j in list_an:
                print("YES")
                print(1, j)
                break
    else:
        print("NO")


t = int(input())
for _ in range(t):
    n, m = map(int, input().split())
    list_an = list(map(int, input().split()))
    list_am = list(map(int, input().split()))
    sub_sequence_numbers(n, m, list_an, list_am)
