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

n=int(input())
for i in range(n):
    (a,b)=map(int, input().split())
    r=list(map(int, input().split()))
    s=list(map(int, input().split()))
    
    def func(r,s):
        if len(r)<=len(s):
            for i in r:
                if i in s:
                    print("YES")
                    return (str(1) + " " + str(i))
                    
                    
        elif len(r)>len(s):
            for i in s:
                if i in r:
                    print("YES")
                    return (str(1) + " " + str(i))
                    
                
    
        return "NO"
        
    print(func(r,s))