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

test=int(input())
for t in range(test):
    lis=input().split()
    a=int(lis[0])
    b=int(lis[1])
    arr=input().split()
    brr=input().split()
    dic1={}
    dic2={}
    for i in arr:
        if i not in dic1:
            dic1[i]=1
        else:
            dic1[i]+=1
    for i in brr:
        if i not in dic2:
            dic2[i]=1
        else:
            dic2[i]+=1 
    flag=0        
    for i in dic1:
        if i in dic2:
            print("YES")
            print("1",end=" ")
            print(i)
            flag=1
            break
    if flag==0:    
        print("NO")    