//#pragma comment(linker, "/stack:247474112")
// #pragma GCC optimize("Ofast")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
// #pragma GCC optimize("unroll-loops")

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

// #include <ext/pb_ds/assoc_container.hpp> 
// #include <ext/pb_ds/tree_policy.hpp> 
// using namespace __gnu_pbds; 
  
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> 
  
#define     pii             pair<int ,int>
#define     ff              first
#define     ss              second
#define     pb(x)           push_back(x ) 
#define     mp              make_pair
#define     sz(x)           x.size()
#define     clr(x)          x.clear()
#define     mem(x ,y)       memset(x , y , sizeof x )
#define     all(a )         a.begin() , a.end()
#define     endl            "\n"
#define     si(x )          scanf("%d", &x)
#define     sii(x,y )       scanf("%d%d", &x,&y)
#define     siii(x,y ,z)    scanf("%d%d%d ", &x,&y , &z)
#define     rep(i ,n )      for(int i = 0 ; i < n ; i++ )
#define     repi(i ,n )     for(int i = 1 ; i <= n ; i++ )
#define     forn(i ,x,n )   for(int i = x ; i <= n ; i++ )
#define     repit(i, c)     for( __typeof((c).begin()) i = (c).begin(); i != (c).end();++i )
#define     dbg(args...)    do {   cerr << #args << ' ' ;  print(args); } while(0); cerr<< endl ;
  
typedef long long ll  ;
typedef unsigned long long  ull ;
typedef vector<int> vi  ;

const ll  mod = (ll) 1e9 +7;
//const int inf = 1e9  ;
const long long  infL = 1e18 ;

int setbit(int n, int pos  ) { return n = n|(1<< pos) ; }
int resetbit(int n,int pos ) {  return n =  n & ~(1<<pos ); }
bool checkbit(int  n,int pos ) { return (bool ) (n&(1<<pos))  ; }

template < typename T > T mul(T x, T y   ) { x %= mod ; y %= mod ; return (x*y)%mod  ;  }
template < typename T > T add(T x, T y  ) { x %= mod ; y %= mod ; return (x+y)%mod ;  }
template < typename T > T modPow(T x, T k ,T mod ) { if(k == 0 ) return 1; if(k&1  ) { return ( (x%mod)*modPow(x,k-1, mod )%mod )%mod ; } else { T ret = modPow(x,k/2 , mod ) ; ret %= mod ; return (ret*ret )%mod; } }
template < typename T > T ext_gcd(T num1 , T num2, T &X , T &Y ) { T r2,r1, q2, q1 , x2, x1, y2 ,y1 , x,  y, r   ; x2 = 1; y2 = 0;  x1 = 0; y1 = 1; for( r2 =num1 ,r1 = num2 ;r1 != 0 ; y2 = y1, y1 = y,x2 = x1 ,x1 = x ,r2 = r1, r1 = r) {q1 = r2/r1; x = x2 - q1*x1; y = y2 - q1*y1; r = r2%r1 ; } X = x2 ; Y = y2 ; return r2 ;  }
template < typename T > T modInv( T x , T m ) {  return modPow(x,m-2 , m) ; }  // long long ret, t ;// ext_gcd( x, m ,ret ,t  ) ;// ret %= m ;// if(ret<0) ret += m  ; // return ret;}
template < typename T > void print(const T& v) {    cerr << v << ' ' ;}
template < typename T1, typename... T2 > void print( const T1& first, const T2&... rest ){ print(first); print(rest...) ;}
// debuging ... 
template < typename F, typename S >
ostream& operator << ( ostream& os, const pair< F, S > & p ) {
    return os << "[ " << p.first << ", " << p.second << " ]";
}

template < typename T >
ostream &operator << ( ostream & os, const vector< T > &v ) {
    os << "[ "; rep(i , sz( v)  )  os << v[i] << ' ' ; return os << " ]" ; 
}

//int dx[] = {0 , 0 ,+1, -1 } ;
//int dy[] = {-1, +1,0 , 0 };
  
const int M = (int )1e6+77 ;  
const int mx = (int)700; 
const int N = 5999 ;

////  code from here ... 

ll a[M+2] ,b[M+2] ;
ll dp[N+2][N+2]  ; 
int n,m ; 
ll func(int i,int j) {  
    if(i>n or j>m) return 0; 
    ll &ans = dp[i][j] ;
    if(ans!=-1 ) return ans ;
    ans = 0 ; 
    ans = add(ans , func(i+1,j)) ; 
    ans = add(ans , func(i,j+1)) ;
    ans = (ans- func(i+1, j+1 )+mod )%mod ; 
    if( a[i ]== b[j] ) 
        ans = add(ans, add(func(i+1, j+1) ,1LL ))   ;
    return ans ; 


}
void solve( ) {
    cin >> n >>m ;  
    repi(i,n  )cin >>a[i] ;
    repi(i, m )cin >>b[i] ;
    mem(dp , -1) ;
    cout << (func(1, 1 )+1LL )%mod  << endl;



}

 
int main() {
    
 
    //  ios::sync_with_stdio(false);  cin.tie(0); cout.tie(0);
     
    int t=1 , c= 0 ;  //si( t) ;
   // clock_t s = clock()    ;
    //cin >>t ; 
    while(t--) {
        solve() ;
    }
    // double e  = (clock() -s )/(CLOCKS_PER_SEC*1.0 )  ;  
    // cerr << "exec time : " <<  e << endl ;; 

}




Measured memory_bytes: 285312