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

# cook your dish here
def incon():
    A = input()
    A = [int(x) for x in A.split()]
    return A
T = int(input())
while T>0:
    T-=1
    N,M = [int(a) for a in input().split()]
    A = incon()
    B = incon()
    ans="NO"
    for i in A:
        if i in B:
            ans="YES"
            break
    print(ans)
    if ans=="YES":
        print(1,i)
