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 = map(int,input().split())
    l1 = list(map(int,input().split()))
    l2 = list(map(int,input().split()))
    k = 0
    for i in range(n):
        if l2.count(l1[i])>=1:
            print("YES")
            print(1,l1[i])
            k = 1
            break
    if k==0:
        print("NO")