#include <bits/stdc++.h>
using namespace std;
int cnt[20][30];
multiset<int> v[30];
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
int res = 1;
for(int i = 1; i <= n; ++i){
string s;
cin >> s;
for(char c : s) ++cnt[i][c-'a'];
res += s.size();
for(int j = 'a'; j <= 'z'; ++j)if(cnt[i][j-'a'] == 0 || (v[j-'a'].find(cnt[i][j-'a']) == v[j-'a'].end())){
v[j-'a'].insert(cnt[i][j-'a']);
}
}
for(int i = 'a'; i <= 'z'; ++i){
int idx = 0;
for(auto x : v[i-'a']){
res -= x*(n-idx-1);
idx++;
}
}
cout << res << '\n';
}
