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

import sys
input=sys.stdin.readline
t=int(input())
for ii in range(t):
    n,m=map(int,input().split())
    a=[int(i) for i in input().split() if i!='\n']
    b=[int(i) for i in input().split() if i!='\n']
    store=[0]*(max(b)+1)
    for i in b:
        store[i]=1
    for i in a:
        try:
            if store[i]==1:
                print('YES')
                print(1,i)
                break
        except:
            pass
    else:
        print('NO')
