#include <bits/stdc++.h>
using namespace std;
using LL = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }


// std::vector Declaration
template<typename T>
vector<T> make_v(size_t a) { return vector<T>(a); }
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts) {
   return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

// std::vector Initialization
template<typename T>
void fill_all(T& arr, const T& v) { arr = v; }
template<typename T, typename U>
void fill_all(T& arr, const U& v) { for (auto& i : arr) fill_all(i, v); }

// std::vector Debug
template<typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
   os << "[";
   bool a = 1;
   for (auto e : v ) {
      os << (a ? "" : " "); 
      os << e;
      a = 0;
   }
   os << "]";
   return os;
}

// std::pair Debug
template<typename T, typename U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
   os << "(" << p.first << " " << p.second << ")";
   return os;
}

// std::set Debug
template<typename T>
ostream& operator<<(ostream& os, const set<T>& st) {
   os << "{";
   bool a = 1;
   for (auto e : st) {
      os << (a ? "" : " ");
      os << e;
      a = 0;
   }
   os << "}";
   return os;
}

// std::multiset Debug
template<typename T>
ostream& operator<<(ostream& os, const multiset<T>& st) {
   os << "{";
   bool a = 1;
   for (auto e : st) {
      os << (a ? "" : " ");
      os << e;
      a = 0;
   }
   os << "}";
   return os;
}

// std::map Debug
template<typename T, typename U>
ostream& operator<<(ostream& os, const map<T, U>& mp) {
   os << "{";
   bool a = 1;
   for (auto e : mp) {
      os << (a ? "" : " ");
      os << e.first << ":" << e.second;
      a = 0;
   }
   os << "}";
   return os;
}

// std::tuple Debug
template<int N, class Tuple>
void out(ostream& os, const Tuple& t){}
template<int N, class Tuple, class H, class ...Ts>
void out(ostream& os, const Tuple& t) {
   if (N) os << " ";
   os << get<N>(t);
   out<N+1,Tuple,Ts...>(os, t);
}
template<class ...Ts>
ostream& operator<<(ostream& os, const tuple<Ts...>& t) {
   os << "(";
   out<0,tuple<Ts...>,Ts...>(os, t);
   os << ")";
   return os;
}

// Debug
#define DUMP(x) cerr<<#x<<" = "<<(x)<<endl


struct edge { int to, cost; };
ostream& operator<<(ostream& os, const edge& e) {
   os << "(" << e.to << ", " << e.cost << ")";
   return os;
}

const LL LINF = 1LL<<60;
const int IINF = 1<<30;
const LL MOD = 1e9+7;

int main()
{
   int N, M; cin >> N >> M;
   vector<int> S(N), T(M);
   for (int i = 0; i < N; ++i) {
      cin >> S[i];
   }
   for (int j = 0; j < M; ++j) {
      cin >> T[j];
   }

   auto dp = make_v<LL>(N+1, M+1);
   auto sum = make_v<LL>(N+1, M+1);
   dp[0][0] = sum[0][0] = 1;
   for (int i = 0; i < N; ++i) {
      sum[i+1][0] = 1;
   }
   for (int j = 0; j < M; ++j) {
      sum[0][j+1] = 1;
   }

   for (int i = 0; i < N; ++i) {
      for (int j = 0; j < M; ++j) {
         if (S[i] == T[j]) {
            dp[i+1][j+1] = sum[i][j];
         }
         sum[i+1][j+1] = (((sum[i+1][j] + sum[i][j+1] - sum[i][j] + dp[i+1][j+1]) % MOD) + MOD) % MOD;
      }
   }
   cout << sum[N][M] << endl;

   return 0;
}


Measured memory_bytes: 62976