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

if __name__ == '__main__':
    t=int(input())
    for i in range(t):
        c=0
        n = list(map(int, input().split()))
        l = list(map(int, input().split()))
        m = list(map(int, input().split()))
        for j in range(n[0]):
            if(m.count(l[j])>=1):
                print("YES")
                print(1,l[j])
                c=c+1
                break
        if(c==0):
            print("NO")
                
                
