#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define _GLIBCXX_DEBUG
using namespace std;
using std::cout;
using std::cin;
using std::endl;
using ll=long long;
const ll mod=1e9+7;
const ll mod_half=5e8+4;
#define rep(i,a) for (ll i=0;i<a;i++)


namespace po167{
//LCP vec[0,n) and vec[i,n)
//for all i 
//O(vec.size())
template<class T>
std::vector<int> Z_algo(std::vector<T> &vec){
	int n=vec.size();
	int ind=1,j=0,k;
	std::vector<int> ans(n,0);
	ans[0]=n;
	while(ind<n){
		while(ind+j<n&&vec[j]==vec[ind+j]) j++;
		ans[ind]=j;
		if(j==0){
			ind++;
			continue;
		}
		k=1;
		while(k+ind<n&&ans[k]+k<j){
			ans[k+ind]=ans[k];
			k++;
		}
		j-=k;
		ind+=k;
	}
	return ans;
}
std::vector<int> Z_algo(std::string &vec){
	int n=vec.size();
	int ind=1,j=0,k;
	std::vector<int> ans(n,0);
	ans[0]=n;
	while(ind<n){
		while(ind+j<n&&vec[j]==vec[ind+j]) j++;
		ans[ind]=j;
		if(j==0){
			ind++;
			continue;
		}
		k=1;
		while(k+ind<n&&ans[k]+k<j){
			ans[k+ind]=ans[k];
			k++;
		}
		j-=k;
		ind+=k;
	}
	return ans;
}
}
using po167::Z_algo;

//  rainy ~ 雨に打たれて ~
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	int N;
	cin>>N;
	vector<ll> A(N+1);
	vector<ll> sum_A(N);
	rep(i,N){
		cin>>A[i];
		if(i) sum_A[i]=(sum_A[i-1]+A[i])%mod;
		else sum_A[i]=A[i];
	}
	string S;
	cin>>S;
	assert(S.size()==N);
	S+="#";
	vector<pair<char,ll>> p(N);
	rep(i,N-1){
		p[i]={S[i+1],A[i+1]};
	}
	auto z_val=Z_algo(p);
	ll ans=0;
	rep(i,N){
		if(S[i]!=S[0]) continue;
		if(A[0]>A[i]){
			ans+=((((A[i]+1)*A[i])%mod)*mod_half)%mod;
			ans%=mod;
		}else{
			ans+=(((A[0]*(A[i]*2-A[0]+1))%mod)*mod_half)%mod;
			ans%=mod;
			if(i==0){
				ans+=sum_A[N-1]-A[0];
				ans%=mod;
				continue;
			}
			ans+=sum_A[z_val[i]]-A[0];
			if(S[z_val[i]+1]==S[z_val[i]+1+i]){
				ans+=min(A[z_val[i]+1],A[z_val[i]+i+1]);
				ans%=mod;
			}
		}
	}
	cout<<ans<<"\n";
}