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())
while(t>0):
    n,m=map(int,input().strip().split())
    l1=list(map(int,input().strip().split()))
    l2=list(map(int,input().strip().split()))
    l3=[]
    count=0
    #flag=0
    for i in l1:
        for j in l2:
            if(i==j):
                l3.append(i)
                count+=1
    if(count==0):
        print("NO")
    elif(count>=1):
        print("YES")
        print("1",l3[0])
        
    t-=1
    