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 = map(int,input().split())
    a = list(map(int,input().strip().split()))[:n]
    b = list(map(int,input().strip().split()))[:m]
    flag = 0
    num = 0
    if n >= m :
        for j in range(m) :
            if b[j] in a :
                flag = 1
                num = b[j]
                break
    else :
        for j in range(n) :
            if a[j] in b :
                flag = 1
                num = a[j]
                break

    if flag == 1 :
        print('YES')
        print(1,num)
    else :
        print('NO')

