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):
    x,y=map(int,input().split())
    A=list(map(int,input().split()))
    B=list(map(int,input().split()))
    m=[]
    for i in range(len(A)):
        for j in range(len(B)):
            if A[i]==B[j]:
                m.append(A[i])
                break
    if len(m)>0:
       print("YES")
       print(1,m[0])
    else:
        print("NO")
    t-=1