#import<bits/stdc++.h>
using namespace std;
long long a,b,c,i,j,k,l,m,n,s,x[2040],y[2040],z[2040][2040];
int main()
{
scanf("%lld%lld",&n,&m);
for(;i++<n;)scanf("%lld",x+i);
for(i=0;i++<m;)scanf("%lld",y+i);
for(i=0;i<=n;i++)for(j=0;j<=m;j++)z[i][j]=(i<1|j<1?1:
z[i-1][j]+z[i][j-1]-(x[i]==y[j]?0:z[i-1][j-1])+1000000007)%1000000007;
printf("%lld",z[n][m]);
}