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

#define REP(i,n) for(long long i = 0; i < (n); i++)
#define FOR(i, m, n) for(long long i = (m);i < (n); ++i)
#define ALL(obj) (obj).begin(),(obj).end()
#define SPEED cin.tie(0);ios::sync_with_stdio(false);

template<class T> using V = vector<T>;
template<class T, class U> using P = pair<T, U>;

const ll MOD = (ll)1e9 + 7;
const ll MOD2 = 998244353;
const ll HIGHINF = (ll)1e18;
const ll LOWINF = (ll)1e15;
const long double PI = 3.1415926535897932384626433;

template<typename T> vector<T> make_v(size_t N,T init){return vector<T>(N,init);}
template<typename... T> auto make_v(size_t N,T... t){return vector<decltype(make_v(t...))>(N,make_v(t...));}
template <class T> void corner(bool flg, T hoge) {if (flg) {cout << hoge << endl; exit(0);}}
template <class T, class U>ostream &operator<<(ostream &o, const map<T, U>&obj) {o << "{"; for (auto &x : obj) o << " {" << x.first << " : " << x.second << "}" << ","; o << " }"; return o;}
template <class T>ostream &operator<<(ostream &o, const set<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const multiset<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const vector<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "") << obj[i]; o << "}"; return o;}
template <class T, class U>ostream &operator<<(ostream &o, const pair<T, U>&obj) {o << "{" << obj.first << ", " << obj.second << "}"; return o;}
template <template <class tmp>  class T, class U> ostream &operator<<(ostream &o, const T<U> &obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr)o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
void print(void) {cout << endl;}
template <class Head> void print(Head&& head) {cout << head;print();}
template <class Head, class... Tail> void print(Head&& head, Tail&&... tail) {cout << head << " ";print(forward<Tail>(tail)...);}
template <class T> void chmax(T& a, const T b){a=max<T>(a,b);}
template <class T> void chmin(T& a, const T b){a=min<T>(a,b);}
void YN(bool flg) {cout << ((flg) ? "YES" : "NO") << endl;}
void Yn(bool flg) {cout << ((flg) ? "Yes" : "No") << endl;}
void yn(bool flg) {cout << ((flg) ? "yes" : "no") << endl;}

class BinaryIndexedTree2DRangeModSumQuery{
public:
    const int N,M;
    const long long mod;
    vector<vector<long long>> bit;

    //1-indexed
    BinaryIndexedTree2DRangeModSumQuery(const int& N,const int& M, const long long& mod):N(N),M(M),mod(mod),bit(N+1,vector<long long>(M+1,0)){
        // do nothing
    }

    inline long long getvar(const int& i,const int& j){
        long long val = 0;
        for(int y=i;y>0;y-=(y&-y)) for(int x=j;x>0;x-=(x&-x)) {
            val += bit[y][x];
            if(val >= mod) val -= mod;
        }
        return val;
    }

    // [x1,x2] * [y1,y2] 1-indexed
    inline long long getvar(const int& y1,const int& y2,const int& x1,const int& x2){
        long long res = getvar(y1-1,x1-1);
        res -= getvar(y1-1,x2);
        if(res < 0) res += mod;
        res -= getvar(y2,x1-1);
        if(res < 0) res += mod;
        res += getvar(y2,x2);
        if(res >= mod) res -= mod;
        return res;
    }

    //add
    inline void update(const int& i,const int& j,long long val){
        if(i==0||j==0) return;
        if(val>=mod) val -= mod;
        if(val < 0) val += mod;
        for(int y=i;y<=N;y+=(y&-y)) for(int x=j;x<=M;x+=(x&-x)) {
            bit[y][x]+=val;
            if(bit[y][x] >= mod) bit[y][x] -= mod;
        }
    }

};


int main() {
    SPEED
    ll N,M; cin >> N >> M;
    V<ll> S(N+1,0);
    for(int i = 1; i <= N; ++i) cin >> S[i];

    V<ll> T(M+1,0);
    for(int i = 1; i <= M; ++i) cin >> T[i];

    BinaryIndexedTree2DRangeModSumQuery bit(N,M,MOD);
    for(int i = 1; i <= N; ++i){
        for(int j = 1; j <= M; ++j){
            bit.update(i,j,(S[i]==T[j]));
        }
    }

    ll ans = 1;
    for(int i = 1; i <= N; ++i){
        for(int j = 1; j <= M; ++j){
            if(S[i]!=T[j]) continue;
            ll val = bit.getvar(1,i-1,1,j-1);
            (ans += (val + 1)) %= MOD;
            bit.update(i,j,val);
        }
    }

    cout << ans << endl; 
    return 0;
}


Measured memory_bytes: 31616