#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <array>
#include <vector>
#include <deque>
#include <list>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <stack>
#include <queue>
#include <bitset>
#include <tuple>
#include <cmath>
#include <complex>
#include <algorithm>
#include <utility>
#include <regex>
#include <cstdint>
#include <numeric>
#include <functional>
#include <cassert>

using namespace std;
using ll = long long;
using ull = unsigned long long;

constexpr ll INF = 1'000'000'000'000'000'000;
namespace utils{
#define ALL(x) begin(x), end(x)
#define rALL(x) rbegin(x), rend(x)
    template<class T, class Compare> using p_queue = priority_queue<T, vector<T>, Compare>;
    template<class T> using min_queue = p_queue<T, greater<T>>;
    template<class T> using max_queue = p_queue<T, less<T>>;

    template<class T> bool min_update(T& X, const T& A){ if(X > A) {X = A; return true;} return false; }
    template<class T> bool max_update(T& X, const T& A){ if(X < A) {X = A; return true;} return false; }
    using V_Set = unordered_set<int>;
    using E_Set = unordered_map<int, V_Set>;

    ll operator"" _64(unsigned long long x){ return ll(x); }
    ull operator"" _64u(unsigned long long x){ return ull(x); }

    template<class T>
    vector<T> make_vector(int n, T t){
        return vector<T>(n, t);
    }
    template<class ...Ts>
    auto make_vector(int n, Ts ... ts){
        return vector<decltype(make_vector(ts...))>(n, make_vector(ts...));
    }

    template<class T>
    ostream& operator<<(ostream& os, const vector<T>& v){
        for (auto &&x : v) { os << x << ' '; } return os ;
    }
}
using namespace utils;

// Residue Class Ring
namespace xelmh_RCR {
    class RCR {
        // Residue Class Ring
        static constexpr ll NIL = -1;
        ll val;
    public:
        static int64_t MOD;
        RCR(ll x) : val(x >= 0 ? x % MOD : MOD - (-x) % MOD) {}
        RCR(signed x) : val(x >= 0 ? x % MOD : MOD - (-x) % MOD) {}
        RCR(ull x) : val(x % MOD) {}
        RCR(unsigned x) : val(x % MOD) {}
        RCR() : val{NIL} {}

        bool is_nil() { return val == NIL; }

        RCR pow(ll n) const {
            ll r = 1, a = val;
            while (n) {
                if (n & 1) {
                    r *= a;
                    r %= MOD;
                }
                a *= a;
                a %= MOD;
                n /= 2;
            }
            return {n};
        }
        RCR inv() const { /* return Inverse */ assert(val != 0);
            return this->pow(MOD - 2);
        }

        void operator+=(const RCR &a) {
            val += a.val;
            if (val >= MOD) val -= MOD;
        }
        void operator-=(const RCR &a) {
            val -= a.val;
            if (val < 0) val += MOD;
        }
        void operator*=(const RCR &a) {
            val *= a.val;
            val %= MOD;
        }
        void operator/=(const RCR &a) {
            val *= a.inv().val;
            val %= MOD;
        }

        RCR operator+(const RCR &x) const {
            ll v = val + x.val;
            return {v};
        }
        RCR operator-(const RCR &x) const {
            ll v = val - x.val;
            return {v};
        }
        RCR operator*(const RCR &x) const {
            ll v = val * x.val;
            return {v};
        }
        RCR operator/(const RCR &x) const {
            ll v = val * x.inv().val;
            return {v};
        }

        bool operator==(const RCR &x) const { return x.val == val; }
        bool operator!=(const RCR &x) const { return x.val != val; }

        friend istream &operator>>(istream &is, RCR &r) {
            ll tmp;
            is >> tmp;
            r = tmp;
            return is;
        }
        friend ostream &operator<<(ostream &os, const RCR &r) { return os << r.val; }
    };

    RCR fact(ll N) {
        /* N -> N! */
        static vector<RCR> cal(1, RCR{1});
        assert(N >= 0);

        if (cal.size() > N) return cal[N];
        else {
            RCR nm = fact(N - 1);
            assert(cal.size() == N);
            cal.push_back(nm * N);
            return cal.back();
        }
    }

    /* N, k -> N C k */
    RCR choice(ll N, ll k) {
        // N! / k!(N-k!)
        RCR ans = fact(N) / (fact(k) * fact(N - k));
        return ans;
    }

    RCR operator "" _mod(unsigned long long x) {
        return RCR{x};
    }
}
using namespace xelmh_RCR;
int64_t RCR::MOD = 1'000'000'007;
//int64_t RCR::MOD = 998'244'353;


class solver{

public:
    void run(istream &is, ostream& os){
        ll N; is >> N;
        ll M; is >> M;
        if(!is) return;
        vector<ll> S(N), T(M);
        for (auto &&s : S) { is >> s; } // end s
        for (auto &&t : T) { is >> t; } // end t

        auto dp = make_vector(N+1, M+1, 0_mod);
        for (int i = 0; i < N+1; ++i) {
            for (int j = 0; j < M+1; ++j) {
                if(i == 0 or j == 0) {
                    dp[i][j] = 1;
                    continue;
                }
                dp[i][j] = dp[i-1][j] + dp[i][j-1] - dp[i-1][j-1];
                if(S[i-1] == T[j-1])
                    dp[i][j] += dp[i-1][j-1];
            } // end j
        } // end i
        cout << dp.back().back() << endl;


    }
};

int main(int argc, char *argv[]) {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << setprecision(16) << scientific;
#ifdef DEBUG
    string test_cases = "test_E.txt";
    cerr << "DEBUG MODE" <<  endl;
    cerr << test_cases << " -->" << endl;
    auto fs = fstream(test_cases, fstream::in);
    int lp = 0;
    while(fs) {
        lp++;
        cout << lp <<  "#------\n";
        solver().run(fs, cout);
    }
    cout << "------#" << endl;
    if(lp <= 1) {
        while(cin) solver().run(cin, cout);
    }
#else
    solver().run(cin, cout);
#endif
    return 0;
}


Measured memory_bytes: 31616