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())
for x in range(t) :
    n, m = map(int, input().split())
    a = []
    b = []
    a = list(input().split(" "))
    b = list(input().split(" "))
    y = 0
    while y < m :
        c = b[y]
        if c in a :
            print("YES")
            print("1", c)
            break
        y = y + 1
    if y == m :
        print("NO")