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

def f(arr1,arr2):
    p=[]
    for i in arr1:
        if i in arr2:
            p.append(i)
            return p
 
    return (p)







t=int(input())
for i in range(t):
    n,m=map(int,input().split())
    arr1=list(map(int,input().split()))
    arr2=list(map(int,input().split()))
    ans=f(arr1,arr2)
    if len(ans)!=0:
        print("YES")
        print(len(ans),*ans,sep=" ")
    else:
        print("NO")
    
