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

k=[]
for t in range(int(raw_input())):
    s=""
    n,m=map(int,raw_input().split())
    a=raw_input().split()
    b=raw_input().split()
    list1= set(a)
    intersection = list1.intersection(b)
    intersection1= [int(x) for x in list(intersection)]
    if intersection1==[]:
        k.append("NO")
    else:
        s=s+str(1)+" "+str(intersection1[0])
        k.append("YES")
        k.append(s)

for t1 in k:
    print(t1)