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):
    f=0
    n,m =map(int, input().split())
    a= list(map(int, input().split()))
    b= list(map(int, input().split()))
    for i in range(n):
        if(a[i] in b):
            print('YES')
            print(str(1)+' '+ str(a[i]))
            f=1
            break
        
    
    if(f==0):
        print('NO')
    t-=1