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