#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  int s[10005];
  int t[10005];
  for (int i = 0; i < n; i++) cin >> s[i];
  for (int i = 0; i < m; i++) cin >> t[i];
  long long dp[2005][2005] = {0};
  for (int i = 0; i <= n; i++) dp[i][0] = 1;
  for (int i = 0; i <= m; i++) dp[0][i] = 1;
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= m; j++) {
      if (s[i - 1] == t[j - 1])
        dp[i][j] = (dp[i][j - 1] + dp[i][j - 1]) % 1000000007;
      else
        dp[i][j] =
            (dp[i][j - 1] + dp[i - 1][j] - dp[i - 1][j - 1] + 1000000007) %
            1000000007;
    }
  }
  cout << dp[n][m] << endl;
  return 0;
}
