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

N = int(input())
for i in range(N):
    n,m = map(int,input().split())
    A = list(map(int,input().split()))
    B = list(map(int,input().split()))
    
    if n < m:
        for i in A:
            if B.count(i)==1:
                print('YES')
                print('1',i)
                break
        else:
            print('NO')
    else:
        for i in B:
            if A.count(i)==1:
                print('YES')
                print('1',i)
                break
        else:
            print('NO')
    