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 i in range(int(input())):
    l = []
    p = 0
    a1 = []
    b1 = []
    s = ""
    n, m = list(map(int, input().split()))
    a = list(map(int, input().split()))
    b = list(map(int, input().split()))
    q = set(a)
    r = set(b)
    z = q.intersection(r)
    u = list(z)
    c = len(z)
    if c == 0:
        print("NO")
    else:
        print("YES")
        print("1", u[0])