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())
 a=list(map(int,input().split()))
 b=list(map(int,input().split()))
 a.sort()
 b.sort()
 k=min(len(a),len(b))
 c=0
 j=0
 while c<n:
   if a[c] in b:
     print('Yes')
     print('1',a[c])
     j=1
     break
   c+=1 
 if (j!=1):
   print('NO')