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 i in range(t):
    n,m=map(int,input().split())
    a=list(map(int,input().split()))[:n]
    b=list(map(int,input().split()))[:m]
    d=0
    temp=0
    for i in range(n):
        for j in range(m):
            if(a[i]==b[j]):
                d=1
                temp=a[i]
                break
    if(d==1):
        print("YES")
        print(d,temp)
    else:
        print("NO")