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 = int(input())
for ii in range(t):
  n, m = map(int, input().split())
  A = set([])
  B = set([])
  a = list(map(int, input().split()))
  b = list(map(int, input().split()))
  for x in a:
    A.add(x)
  for x in b:
    B.add(x)
  v = [0] * 1010
  for x in A:
    v[x] += 1
  for x in B:
    v[x] += 1
  ans = -1
  for i in range(1010):
    if v[i] == 2:
      ans = i
      break
  if ans == -1:
    print('NO')
  else:
    print('YES')
    print(1, ans)