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 i in range(t):
    n, m = input().split()
    n = int(n)
    m = int(m)

    arrA = input().split()
    arrB = input().split()

    maxIter = min(len(arrA), len(arrB))
    arrC = []

    for a in arrA:
        if a in arrB:
            arrC.append(a)

    if not arrC:
        print('NO')
    else:
        print('YES')
        print('1', end=' ')
        print(arrC[0])