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 test in range (t):
    n,m=input().split()
    a=input().split()
    b=input().split()
    # for i in range(len(a)):
    #     a[i]=int(a[i])
    # for i in range(len(b)):
    #     b[i]=int(b[i])
    found=False
    for i in a:
        if i in b:
            print('YES')
            print('1',i)
            found=True
            break
    if not found:
        print('NO')