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 func(a,b):
    c=set(a)
    d=set(b)
    e=c.intersection(d)
    e=list(e)
    if len(e)>0:
        return 'YES',1,e[0]
    else:
        return 'NO'
    
res=[]    
for t in range(int(input())):
    n,m=map(int,input().split())
    a=[int(i) for i in input().split()]
    b=[int(i) for i in input().split()]
    res.append(func(a,b))
for i in res:
    if i!='NO':
        print(i[0])
        print(i[1],i[2])
    else:
        print(i)
