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())
while(t):
    n,m = map(int,input().split())
    a = list(map(int,input().split()))
    b = list(map(int,input().split()))
    ans = 0
    flag = 1
    for i in range(n):
        if (a[i] in b):
            ans = a[i]
            print("YES")
            print(1, ans)
            flag = 0
            break
    if (flag):
        print("NO")
    t-=1

