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 z in range(T):
    m,n=[int(x) for x in input().split()]
    a=[int(x) for x in input().split()]
    b=[int(x) for x in input().split()]

    c=[]

    for e in a[:]:
        if e in b:
            c.append(e)
            break

    if len(c)==1:
        print("YES")
        print(1," ",c[0])
    else:
        print("NO")
