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

n=int(input())
for i in range(0,n):
    a,b=map(int,input().split())
    l=list(map(int,input().split()))
    l1=list(map(int,input().split()))
    a-=1
    b-=1
    l.sort()
    l1.sort()
    p=set(l)
    q=set(l1)
    print(p,q)
    c=min(a,b)
    f=0
    if c==a:
        for j in p:
            if j in q:
                output=j
                f=1
                break
    else:
        for j in q:
            if j in p:
                output=j
                f=1
                break
    if(f==1):
        print("YES")
        print(f'{1} {output}')
    else:
        print("NO")
            
            
    