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 hh in range(0,t):
    n,m=[int(x) for x in input().split()]
    a=[int(x) for x in input().split()]
    b=[int(x) for x in input().split()]
    d=dict()
    for i in a:
        if i not in d:
            d[i]=1
        else:
            d[i]+=1
    flag=0
    for i in range(0,len(b)):
        val=b[i]
        if val in d:
            flag=1
            ans=val
            break
    if flag==1:
        print("YES")
        print(1,ans)
    else:
        print("NO")
