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())
for t in range(T):
    N, M = list(map(int ,input().split()))
    a = list(map(int, input().split()))
    b = list(map(int, input().split()))
    counts = set()
    for e in a:
        counts.add(e)
    found = False
    for e in b:
        if(e in counts):
            print("YES")
            print(1, e)
            found = True
            break
    if(not(found)):
        print("NO")