#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
// #include <ext/pb_ds/detail/standard_policies.hpp>
using namespace std;
using namespace __gnu_pbds;
// const ll RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
// gp_hash_table<int, int> table;
 
#define ll long long int
#define vii vector< ll >
#define pb push_back
#define pii pair<ll,ll>
#define all(x) x.begin(),x.end()
#define S second
#define F first
#define ins insert
#define ld long double
#define lp(l,r) for(i=l;i<=r;++i)
 
#define lpj(l,r) for(j=l;j<=r;++j)
#define lpr(l,r) for(i=r;i>=l;--i)
#define lprj(l,r) for(j=r;j>=l;--j)
 
#define swap(a,b){ auto _t=a;a=b,b=_t;}
#define flush() cout.flush()
#define popcount __builtin_popcount
#define die() return 0;
 
 
// typedef __int128 bign;
 
 
#define TRACE
 
#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
	cerr << name << " : " << arg1 << std::endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
	const char* comma = strchr(names + 1, ',');cerr.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
}
#else
#define trace(...)
#endif
 
#define MD          1000000007
#define M 			2011
#define LN 			14
#define fftmod      998244353
#define EPS         (double)1e-10
 
ll md=MD;
ll inf=1e18;
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); 
 
 
inline ll exp(ll a,ll b){ll r=1LL;while(b>0){if(b&1){r=r*(a%md);r=(r+md)%md;}b/=2;a=(a%md)*(a%md);a=(a+md)%md;}return (r+md)%md;}
ll gcd(ll a,ll b){if(b==0)return a;if(a==0)return b;return gcd(b,a%b);}
inline ll poww(ll a,ll b){ll r=1LL;while(b>0){if(b&1)r=r*a;b/=2;a=a*a;}return (ll)r;}
 
using cd=complex<double>;
const double PI=acos(-1);
 
inline ll rand(ll l,ll r){
	return l+rng()%(r-l+1);
}

ll a[M],b[M];
ll dp[M][M];
int main(){
 
 
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
 
   // ifstream fin("input.txt");ofstream fout("outut.txt");
    ll t,i,j,m,n,s,z,k,p;string s1,s2;ll q;ll x,y;
    cin>>n>>m;
    lp(1,n)cin>>a[i];
    lp(1,m)cin>>b[i];
    for(i=0;i<=n;++i)dp[i][0]=1;
    for(i=1;i<=m;++i)dp[0][i]=1;

    for(i=1;i<=n;++i){
    	for(j=1;j<=m;++j){
    		ll ans=0;
    		ans+=dp[i][j-1]%md;
    		ans+=dp[i-1][j]%md;
    		ans-=dp[i-1][j-1]%md;
    		// trace(ans,i,j,a[i],b[j]);
    		if(a[i]==b[j]){
    			ans+=dp[i-1][j-1]%md;
    		}ans%=md;
    		dp[i][j]=ans%md;
    	}
    }
    p=0;cout<<dp[n][m]<<"\n";





}	