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 _ in range(int(input())):
                             n,m=map(int,input().split())
                             l=[int(x) for x in input().split()]
                             ll=[int(x) for x in input().split()]
                             a=0
                             for i in range(len(l)):
                                                    if l[i] in ll:
                                                                 a=1                        
                                                                 ans=l[i]
                                                                 break
                             if a==0:print("NO")
                             else:
                                  print("YES")
                                  print(1,ans)
                                     
                                     


