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 = input()
for t in range(T) :
  N, M = map(int,raw_input().split())
  a = map(int,raw_input().split())
  b = map(int,raw_input().split())
  
  ans = False
  common = set(a)
  for m in range(M) : 
    if b[m] in common :
      print "YES"
      print 1, b[m]
      ans = True
      break
  
  if not ans : print "NO"