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 _ in range(T):
    n,m=map(int,input().split())
    arr1=list(map(int,input().split()))
    arr2=list(map(int,input().split()))
    for i in arr1:
        flag=True
        for j in arr2:
            if i==j:
                flag=False
                x=j
                break
        if flag==False:
            break
    if flag:
        print('NO')
    else:
        print('YES')
        print(1,end=' ')
        print(x)
    
