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())

for i in range(t):
    n,m = list(map(int,input().split()))
    arr1_list = list(map(int,input().split()))
    arr2_list = list(map(int,input().split()))

    ans = "NO"
    arr1_set = set(arr1_list)
    arr2_set = set(arr2_list)
    
    if(arr1_set & arr2_set):
        comm = list(arr1_set & arr2_set)
        ans = "YES"
        ele = comm[0]
    if ans== "YES":
        print(ans)
        print(1,ele)
    else:
        print(ans)