#include<bits/stdc++.h>
using namespace std;
char s[1000];
long long ans=0;
int main(){
    cin>>s;
    for(int i=0;s[i];++i){
        if(s[i]>='a' && s[i]<='z'){
            if(s[i]=='a' && s[i]=='d' && s[i]=='g' && s[i]=='j' && s[i]=='m' && s[i]=='p' && s[i]=='t' && s[i]=='w') ans++;
            else if(s[i]=='b' && s[i]=='e' && s[i]=='h' && s[i]=='k' && s[i]=='n' && s[i]=='q' && s[i]=='u' && s[i]=='x') ans+=2;
            else if(s[i]=='c' && s[i]=='f' && s[i]=='i' && s[i]=='l' && s[i]=='o' && s[i]=='r' && s[i]=='v' && s[i]=='y') ans+=3;
            else if(s[i]=='s' && s[i]=='z') ans+=4;
        }
        else if(s[i]==' ') ans++;
    }
    cout<<ans;
}