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

def main():
    t = int(input())
    for __ in range(t):
        n = input()
        a  = set(map(int,input().split()))
        b = set(map(int,input().split()))
        c = a.intersection(b)
        if len(c) >= 1:
            print("YES")
            print(1, list(c)[0])
        else:
            print("NO")
if __name__ == '__main__':
    main()
