#include<stdio.h>
int main()
{
    char a;
    int s=0;
    while(scanf("%c",&a)!=EOF)
    {
        if(a==' ') s++;
        else if(a>='a'&&a<='o')
            s+=(a-'a'+1)%3;
            if((a-'a'+1)%3==0) s+=3;
        else if(a>='p'&&a<='s') 
            s+=(a-'a'+1)%4;
            if((a-'a'+1)%4==0) s+=4;
        else if(a>='t'&&a<='v')
            s+=(a-'a'+1)%3;
            if((a-'a'+1)%3==0) s+=3;
        else if(a>='w'&&a<='z') 
            s+=(a-'a'+1)%4;
            if((a-'a'+1)%4==0) s+=4;
        
    }
    printf("%d",s);
    return 0;
}