#include<bits/stdc++.h>
#include<vector>
#include<string>
#define ll long long
#define ull unsigned long long
using namespace std;
const int N=26;
const ll md=1e9+7;
ll n,cnt[26],nt[N],v[N];
string s;
ll pow(ll x,ll y){
ll res=1;
for(int i=1;i<=y;y++){
res*=x;
}
cout<<res<<endl;
return res;
}
struct aa{
ll id,v;
bool operator<(const aa &x){
return v>x.v;
}
};
void solve(){
//fuck
cin>>n;
for(int i=0;i<26;i++){
cnt[i]=0;
nt[i]=0;
v[i]=-1;
}
for(int i=1;i<=n;i++){
cin>>s;
int len=s.length();
for(int j=0;j<len;j++){
if(j==0)nt[s[j]-'a']=1;
cnt[s[j]-'a']+=pow(10,len-j-1);
}
}
vector<aa>zm;
for(int i=0;i<26;i++){
if(cnt[i]==0)continue;
zm.push_back({i,cnt[i]});
}
sort(zm.begin(),zm.end());
int now=2;
for(int i=0;i<zm.size();i++){
if(nt[zm[i].id]){
v[zm[i].id]=1;
break;
}
}
for(int i=0;i<zm.size();i++){
if(!nt[zm[i].id]){
v[zm[i].id]=0;
break;
}
}
for(int i=0;i<zm.size();i++){
if(v[zm[i].id]==-1){
v[zm[i].id]=now;
now++;
}
}
ll ans=0;
for(int i=0;i<zm.size();i++){
ans+=v[zm[i].id]*zm[i].v;
}
cout<<ans<<endl;
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
int t=1;
// cin>>t;
while(t--){
solve();
}
}
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