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())
while(t):
  n,m=map(int,input().split())
  a=list(map(int,input().split()))
  b=list(map(int,input().split()))
  d={}
  f=0
  for x in a:
    d[x]=1
  for x in b:
    if(x in d):
      f=1
      break
  if(f):
    print("YES")
    print("1",x)
  else:
    print("NO")
  t-=1