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):
    n,m=[int(i) for i in input().split(' ')]
    an=[int(i) for i in input().split(' ')]
    am=[int(i) for i in input().split(' ')]
    x=0
    for j in range(n):
        for k in range(m):
            if an[j]==am[k]:
                x=1
                print('Yes')
                print('1'+" "+str(an[j]))
                break
        if x==1:
            break
    if x==0:
        print('No')
        