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):
    tt,ttt=input().split()
    n=int(tt)
    m=int(ttt)
    a1=[]
    b1=[]
    found=False
    v=0;
   #for j in range(0,n):
    a1=list(map(int, input().split()))
#   for k in range(0,m):
    b1=list(map(int, input().split()))
    for ii in a1:
        if ii in b1:
            v=ii
            found=True
        
            
            
    if(found==True):
        print("YES\n")
        print(1,v)
    else:
        print("NO")    
    t-=1