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

try:
    for t in range(int(input())):
        n,m = map(int,input().split())
        a = list(map(int,input().split()))
        b= list(map(int,input().split()))
        k = 0
        for i in range(0,m):
            if(b[i] in a):
                g = b[i]
                k = 1
                break
        if(k==0):
            print('NO')
        else:
            print(k,' ',g)
except EOFError as e:
    pass
