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

tt = int(input())

def intersect(lst1, lst2): 
    temp = set(lst2) 
    lst3 = [value for value in lst1 if value in temp] 
    return lst3 

for t in range(tt):
    na, nb = map(int, input().split())
    la = list(map(int, input().split()))
    lb = list(map(int, input().split()))
    inter = intersect(la, lb)

    if len(inter)==0:
        print("NO")
        continue
    print('YES')
    print(1, inter[0])
