#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  long long n, m;
  cin >> n >> m;
  int arr1[n], arr2[m];
  for (int i = 0; i < n; i++) cin >> arr1[i];
  for (int j = 0; j < m; j++) cin >> arr2[j];
  int dp[n + 1][m + 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 - 1][j] + dp[i][j - 1] - dp[i - 1][j - 1];
      if (arr1[i - 1] == arr2[j - 1]) dp[i][j] += dp[i - 1][j - 1];
      dp[i][j] += (int)(1e9 + 7);
      dp[i][j] %= (int)(1e9 + 7);
    }
  }
  cout << dp[n][m];
  return 0;
}
