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 i in range(t):
  m,n = map(int, input().split())
  a = list(map(int, input().split()))
  b = list(map(int, input().split()))
  c = set(a)
  d = set(b)
  if len(c.intersection(d)) == 0:
    print("NO")
  else:
    com = 0
    for i in a:
      if i in b:
        com = i
        break
    print("YES")
    print("1 " +  str(com))