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

t=int(input())
for test in range(t):
    n,m=map(int,input().split())
    l=list(map(int,input().split()))
    li=list(map(int,input().split()))
    l.sort()
    #l=l[::-1]
    li.sort()

    #li=li[::-1]
    flag=0
    ls=[]
    for i in range(len(l)):
        for j in range(len(li)):
            if l[i]==li[j]:
                flag=1
                ls.append(l[i])
                #print("YES")
                #print(1,l[j])
                break
    if flag==1:
        print("YES")
        print(1,ls[0])
        
    if flag==0:
        print("NO")
    