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
I = lambda : list(map(int,input().split()))

m,=I()
while m:
    x,y=I()
    a=I()
    b=I()
    flag=0
    for i in a:
        for j in b:
            if i==j:
                print('YES')
                print(1,i)
                flag=1
                break
        if flag==1:
            break
    if flag==0:
        print('NO')
    m-=1
