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())
while (t>0):
    n,m=input().split()
    n,m=int(n),int(m)
    arr1=input().split()
    arr2=input().split()
    flag=0
    for i in arr1:
        if (i in arr2):
            print("YES")
            print ("1 "+i)
            flag=1
            break
    if (flag==0):
        print("NO")
    t-=1