#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
using ll = long long;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector<int> s(n + 1), t(m + 1);
  vector<vector<ll>> dp(n + 1, vector<ll>(m + 1));
  for (int i = 1; i <= n; i++) cin >> s[i];
  for (int i = 1; i <= m; i++) cin >> t[i];
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) {
      dp[i][j] = (dp[i - 1][j] + dp[i][j - 1]) % 1000000007LL;
      if (s[i] == t[j])
        dp[i][j] = (dp[i][j] + 1) % 1000000007LL;
      else
        dp[i][j] = (dp[i][j] - dp[i - 1][j - 1]) % 1000000007LL;
    }
  }
  cout << (dp[n][m] + 1) % 1000000007LL;
  return 0;
}
