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

for i in range(int(input())):
    a,b = map(int,input().split())
    li1 = list(map(int,input().split()))
    li2 = list(map(int,input().split()))
    li3 = []
    for j in range(len(li1)):
        a = li1[j]
        for k in range(len(li2)):
            if li2[k] == a:
                li3.append(li2[k])
    if len(li3)>0:
        print('YES')
        print(len(li3),*li3)
    else:
        print('NO')    