#include <bits/stdc++.h>
using namespace std;
int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  int N, M;
  cin >> N >> M;
  vector<int> S(N), T(M);
  for (auto& s : S) cin >> s;
  for (auto& t : T) cin >> t;
  const unsigned long MOD = 1e9 + 7;
  vector<unsigned long> dp[2];
  dp[0].resize(M + 1, 1);
  dp[1].resize(M + 1, 0);
  dp[1][0] = 1;
  for (int i = 1; i <= N; i++)
    for (int j = 1; j <= M; j++) {
      auto dpi = i % 2;
      auto& cdp = dp[dpi];
      auto& pdp = dp[!dpi];
      cdp[j] = cdp[j - 1] + pdp[j];
      if (S[i - 1] != T[j - 1]) cdp[j] -= pdp[j - 1];
      cdp[j] %= MOD;
    }
  cout << dp[N % 2][M] << endl;
  return 0;
}
