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

n=int(input())
final=[]
for j in range(n):
    a,b=input().split()
    l=[int(x) for x in input().split()]
    m=[int(x) for x in input().split()]
    l=set(l)
    m=set(m)
    intersection=l.intersection(m)
    fu = list(intersection)
    if(len(fu)==0):
        final.append("NO")
    else:
        a=[]
        a.append("YES")
        a.append(fu[0])
        final.append(a)    
for i in range(len(final)):
    if(final[i]=="NO"):
        print(final[i])
    else:
        print(*final[i])

        
        