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 find(l1,l2):
    l3=[]
    start=-1
    count=0
    for i in range(len(l1)):
        for j in range(start+1,len(l2)):
            if l1[i]==l2[j]:
                start=j
                l3.append(l1[i])
                break
    if len(l3)>0:
        print("YES")
        print(1,l3[0])
    else:
        print("NO")
t=int(input())
while(t):
    n,m=input().split()
    l1=list(map(int,input().split()))
    l2=list(map(int,input().split()))
    find(l1,l2)
    t-=1
    
    