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

for _ in range(int(input())):
    n,m=[int(x) for x in input().split(' ')]
    l1=[int(x) for x in input().split(' ')]
    l2=[int(x) for x in input().split(' ')]
    s1 = set(l1)
    inter = s1.intersection(l2)
    z1 = list(inter)
    if len(z1) >= 1:
        print("YES")
        print("{} {}".format(1,z1[0]))
    else:
        print("NO")
