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

start_value = int(input())
for iqm in range(start_value):
    n,k = map(int,input().split())
    arr1=list(map(int,input().split()))
    arr2=list(map(int,input().split()))
    cnt=[]
    mini=100000
    for i in arr1:
        if i in arr2: 
            cnt.append(arr2.count(i))
            mini = min(mini, arr2.count(i))
        else: cnt.append('0')
    if(mini == 100000): print("NO")
    else:
        print("YES")
        print(mini, arr1[cnt.index(mini)])
