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 ts in range(t):
    n,m=(input().split())
    n=int(n)
    m=int(m)
    
    lst1 = list(map(int,input().strip().split()))[:n] 
    lst2 = list(map(int,input().strip().split()))[:m]
    for i in lst1:
        if i in lst2:
            print("YES")
            print(1,end=" ")
            print(i)
            break
        elif i==lst1[-1]:
            print("NO")    
            break
    
            
            
            