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())
    a = list(map(int, input().split()))
    b = list(map(int, input().split()))
    a.sort()
    b.sort()
    i = 0
    j = 0
    ans = 0
    while i<n and j<m:
        if a[i] == b[j]:
            ans = a[i]
            break
        elif a[i] < b[j]:
            i+=1
        else:
            j+=1
    if ans == 0:
        print('NO')
    else:
        print('YES')
        print(1,ans)