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())
a=[]
b=[]
c=[]

for i in range(n):
    m = list(map(int,input().split()))
    p = list(map(int,input().split()))
    q = list(map(int,input().split()))
    a.append(p)
    b.append(q)
for i in range(n):
    for j in a[i]:
        if j in b[i]:
            c.append(j)
    if len(c)>0:
         print("YES")
         print(1,end=' ')
         print(c[0])
         c.clear()
    else:
        print("NO")




