#include <algorithm>
#include <iostream>
using namespace std;

int main() {
	// your code goes here
	int n;
	cin>>n;
	long long int cost[n];
	for(int i=0;i<n;i++){
		cin>>cost[i];
	}
	//cout<<cost[0];
	string str[n];
	string strR[n];
	for(int i=0;i<n;i++){
		cin>>str[i];
	}
	
	long long int dp[n][2];
	dp[0][0]=0;
	dp[0][1]=cost[0];
	//cout<<dp[0][0]<< " "<< dp[0][1]<<"\n";
	strR[0]=str[0];
	reverse((strR[0]).begin() , (strR[0]).end());
	
	for(int i=1;i<n;i++){
		int flag0=0, flag1=0;
		if(str[i]>=str[i-1]  && dp[i-1][0] != -1)
		 { dp[i][0]=dp[i-1][0]; 	flag0=1; }
		 
		if(str[i]>=strR[i-1] && dp[i-1][1] != -1)
		 { dp[i][0]=min(dp[i][0],dp[i-1][1]); 	flag0=1; }
		 
		strR[i]=str[i];
		reverse((strR[i]).begin() , (strR[i]).end());
		
		if(strR[i] >= str[i-1]  && dp[i-1][0] != -1)
			{dp[i][1]= dp[i-1][0] + cost[i];	flag1=1;}
			
		if(strR[i] >= strR[i-1] && dp[i-1][1] != -1)
			{dp[i][1] = min(dp[i][1], (dp[i-1][1] +cost[i]));	flag1=1;	}
			
	    if(flag0==0)
	    	dp[i][0]=	-1;
	    if(flag1==0)
	    	dp[i][1]=	-1;
	}
	/*
	for(int i=0;i<n;i++){
		cout<<dp[i][0] <<" "<< dp[i][1]<<"\n";
	}
	*/
	if(dp[n-1][0] >= 0 && dp[n-1][1]>= 0)
	cout<<min(dp[n-1][0], dp[n-1][1])<<"\n";
	else{
		if(dp[n-1][0]<0 && dp[n-1][1]>=0)
		   cout<<dp[n-1][1]<<"\n";
		 if(dp[n-1][0]>=0 && dp[n-1][1]<0)
			cout<<dp[n-1][0]<<"\n";
		if(dp[n-1][0]<0 && dp[n-1][1]<0)
			cout<<"-1\n";
	}
	return 0;
}