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

#by the name of Allah
for _ in range(int(input())):
    num, mum = map(int, input().split())
    lis1 = list(map(int, input().split()))
    lis2 = list(map(int, input().split()))
    flg = 0
    for i in range(num):
        if (lis1[i] in lis2):
            print("YES")
            print("1 {0}".format(lis1[i]))
            flg = 1
            break
    if (flg == 0):
        print("NO")
