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 _ in range(int(input())):
    a,b=map(int,input().split())
    arr1=list(map(int,input().split()))
    arr2=list(map(int,input().split()))
    count=0
    for i in range(len(arr1)):
        for j in range(len(arr2)):
            if arr1[i]==arr2[j]:
                count+=1
                a=arr1[i]
                break
    
    if count>=1:
        print("YES")
        print(count,a)
    else:
        print("NO")