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

a=int(input())
for i in range(0,a):
    n,m=input().split()
    arr=list(map(int,input().split()))
    brr=list(map(int,input().split()))
    ans=[]
    for i in arr:
        if(i in brr):
            ans.append(i)
    d=dict()
    for i in brr:
        d[i]=[]
    for i in range(0,len(brr)):
        d[brr[i]].append(i)
    k=0
    if(len(ans)>0):
        print("YES")
        print(1,ans[0])
    else:
        print("NO")