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

tc = int(input())
while tc :
    tc -= 1
    n , m = map(int , input().strip().split())
    a = list(map(int , input().strip().split()))

    mark = [False for i in range(1001)]
    for x in a :
        mark[x] = True

    b = list(map(int , input().strip().split()))
    found = False
    for x in b :
        if mark[x] :
            print("YES\n1 " + str(x))
            found = True
            break
    if not found :
        print("No\n")
