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())
count=0
c=[]
for i in range(t):
  n,m=map(int,input().split())
  a=list(map(int,input().split()))
  b=list(map(int,input().split()))
  count=0
  c.clear()
  for j in range(n):
    for p in range(m):
      if a[j]==b[p]:
        print('YES')
        c.append(a[j])
        count+=1
        break
    if count>0:
        break
  if count>0:
    print(len(c),*c)    
  else:
    print('NO')
      
		 