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

num = int(input())
for i in range(num):
    a = [];b = []
    n,m = [int(x) for x in input().split(' ')]
    a = [int(x) for x in input().split(' ')]
    b = [int(x) for x in input().split(' ')]
    for j in range(len(a)):
        if a[j] in b:
            print('YES')
            print('1 ' + str(a[j]))
            break
        
