#include<bits/stdc++.h>
using namespace std;
int main(){
    int sum=0;
    string n;cin>>n;
    for(int i=1;i<=n.size();i++){
        if(i!=1){
            sum+=26;
            sum--;
        }
        if(i>6){
            cout<<0;
            return 0;
        }
        if(n[i]=='a')sum+=1;
        if(n[i]=='b')sum+=2;
        if(n[i]=='c')sum+=3;
        if(n[i]=='d')sum+=4;
        if(n[i]=='e')sum+=5;
        if(n[i]=='f')sum+=6;
        if(n[i]=='g')sum+=7;
        if(n[i]=='h')sum+=8;
        if(n[i]=='i')sum+=9;
        if(n[i]=='j')sum+=10;
        if(n[i]=='k')sum+=11;
        if(n[i]=='l')sum+=12;
        if(n[i]=='m')sum+=13;
        if(n[i]=='n')sum+=14;
        if(n[i]=='o')sum+=15;
        if(n[i]=='p')sum+=16;
        if(n[i]=='q')sum+=17;
        if(n[i]=='r')sum+=18;
        if(n[i]=='s')sum+=19;
        if(n[i]=='t')sum+=20;
        if(n[i]=='u')sum+=21;
        if(n[i]=='v')sum+=22;
        if(n[i]=='w')sum+=23;
        if(n[i]=='x')sum+=24;
        if(n[i]=='y')sum+=25;
        if(n[i]=='z')sum+=26;
    }
    cout<<sum;
}

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