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 k in range(t):
  nm = list(map(int, input().split()))
  n = nm[0]
  m = nm[1]
  a = list(map(int, input().split()))
  b = list(map(int, input().split()))
  
  def common(list1, list2):
    result = 0
    for x in list1:
      for y in list2:
        if x == y:
          result = x
    return result
  if common(a,b) == 0:
    print('NO')
  else:
    del a[0:a.index(common(a,b))]
    del b[0:b.index(common(a,b))]
    print("YES")
    print(1, a[0])