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())
s = []
for i in range(t):
    n, m = map(int, input().split())
    a = input().split()
    b = input().split()
    if len(set(a) & set(b)) == 0:
        s.append(('NO',))
    else:
        l = list(set(a) & set(b))
        s.append(('YES', (1, l[0])))
for elem in s:
    if len(elem) == 1:
        print(elem[0])
    else:
        print(elem[0])
        print(*elem[1])
