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