#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  constexpr ll MOD = 1e9 + 7;
  ll n, m;
  cin >> n >> m;
  vector<ll> s(n + 1), t(m + 1);
  for (int i = 1; i <= n; ++i) cin >> s[i];
  for (int i = 1; i <= m; ++i) cin >> t[i];
  vector<vector<ll>> dp(n + 1, vector<ll>(m + 1));
  dp[0][0] = 1;
  for (int i = 0; i <= n; ++i) dp[i][0] = 1;
  for (int j = 0; j <= m; ++j) dp[0][j] = 1;
  for (int i = 1; i <= n; ++i) {
    for (int j = 1; j <= m; ++j) {
      (dp[i][j] += dp[i][j - 1] + dp[i - 1][j] - dp[i - 1][j - 1]) %= MOD;
      if (s[i] == t[j]) (dp[i][j] += dp[i - 1][j - 1]) %= MOD;
    }
  }
  cout << dp[n][m] << endl;
  return 0;
}
