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 _ in range(t):
    n,m = map(int,input().split())
    freq = [0 for i in range(1001)]
    flag = 0

    inp1 = [int(i) for i in input().split()]
    inp2 = [int(i) for i in input().split()]

    for i in range(n):
        freq[inp1[i]] = freq[inp1[i]]+1
    
    for j in range(m):
        if freq[inp2[j]] == 1:
            print('YES')
            print(1,inp2[j])
            flag = 1
            break
    
    if flag == 0:
        print("NO")






 
            


        



        

