#include <string>
using namespace std;
unsigned long long int value(string s){
if(s.length() == 0 || s.length() > 5)return 0;
bool cuvant = true;
unsigned long long int v = s.length(), p = 6;
for(int i = 0; cuvant && i < s.length(); i++){
cuvant = s[i] >= 'a' && s[i] <= 'z';
v += (s[i]-'a') * p;
p *= 26;
}
if(!cuvant) return 0;
else return v;
}