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 tt in range (t):
    c=0
    n,m=map(int, input ().split())
    a=list(map(int, input ().split()))
    b=list(map(int, input ().split()))
    for i in range (0,len(a)):
        for j in range (0,len(b)):
            if(a[i]==b[j]):
                c=1
                p=a[i]
                break
        if(c==1):
            break
    if(c==1):
        print ('YES')
        print (1,p)
    else:
        print ('NO')
        
                
    
