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 _ in range(t):
    (n, m) = map(int, input().split())
    ar = list(map(int, input().split()))
    br = list(map(int, input().split()))
    dict1 = {}
    dict2 = {}
    for i in range(len(ar)):
        if ar[i] in dict1:
            dict1[ar[i]] += 1
        else:
            dict1[ar[i]] = 1
    for i in range(len(br)):
        if br[i] in dict2:
            dict2[br[i]] += 1
        else:
            dict2[br[i]] = 1
    flag = False
    for i in dict1:
        if i in dict2:
            flag = True
            val = i
            break

    if flag == True:
        print("YES")
        print("1 {}".format(val))
    else:
        print("NO")
