#include<stdio.h>
#include<string.h>
int main(void)
{
	char ch[210];
	fgets(ch,210,stdin);
	int i,count=0,m;
	m=strlen(ch);
	for(i=0;i<m-1;i++){
		//printf("%c*",ch[i]);
	     if(ch[i]==' '){
	     	count++;
		 }else if(ch[i]<='o'){
		 	count=count+((ch[i]-'a')%3)+1;
		 }else if(ch[i]<='s'){
		 	count=count+ch[i]-'p'+1;
		 }else if(ch[i]<='v'){
		 	count=count+ch[i]-'t'+1;
		 }else if(ch[i]<='z'){
		 	count=count+ch[i]-'w'+1;
		 }
		 //printf("%c*",ch[i]);
	}
	printf("%d",count);
	return 0;
}