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())
while t > 0:
    n, m = map(int, input().split())
    l = set(map(int, input().split()))
    p = set(map(int, input().split()))
    j2=[i for i in l]
    if all([i in l for i in p]):
        print("YES")
        print("1" + " " + str(j2[0]))
    else:
        k = l.intersection(p)
        l1=[i for i in k]
        if len(l1)!=0:
            print("YES")
            print("1" + " " +str(l1[0]))
        else:
            print("NO")
    t -= 1