mod=10**9+7
n,m=map(int,input().split())
s=list(map(int,input().split()))
t=list(map(int,input().split()))
dp1=[1]*(m+1)
dp2=[1]*(m+1)
for i in range(n):
  for j in range(m):
    if s[i]==t[j]:dp1[j+1]=dp2[j+1]+dp1[j]
    else:dp1[j+1]=dp2[j+1]+dp1[j]-dp2[j]
    dp1[j+1]%=mod
  dp2=dp1.copy()
  dp1=[1]*(m+1)
print(dp2[-1])