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

cases = int(input())

for i in range(cases):
    l1 = input().split(' ')
    n = int(l1[0])
    m = int(l1[1])
    arr1 = []
    l2 = input().split(' ')
    for j in l2:
        arr1.append(int(j))

    arr2 = []
    l3 = input().split(' ')
    for k in l3:
        arr2.append(int(k))
    pos = False
    for ele in arr1:
        if ele in arr2:
            print ("YES")
            print (1, ele)
            pos = True
            break
    if not pos:
        print ("NO")