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

for i in range(int(input())):
    a=map(int,input())
    l=list(map(int,input().split()))
    l1=list(map(int,input().split()))
    ans=[]
    flag=0
    for k in range(len(l)):
        for j in range(len(l1)):
            if l[k]==l1[j]:
                ans.append(l[k])
                flag=-1
                break
        if flag==-1:
            break    
    if len(ans)>0:
        print("YES")
        print(len(ans),*ans)
    else:
        print("NO")
