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

def common_elements(list1, list2):
    return [element for element in list1 if element in list2]

t = int(input())
while t>0:
    al, bl = [int(x) for x in input().split()]
    a = [str(int(x)) for x in input().split()]
    b = [str(int(x)) for x in input().split()]
    ccc = common_elements(a, b)
    ccc = sorted(ccc, key=len)
    if len(ccc)>0:
        print("YES")
        print(f'{len(ccc[0])} {" ".join(ccc[0])}')
    else: print("NO")
    t-=1

