#include<stdio.h>
#include<string.h>
int main()
{
	char ch;int n,sum=0;
	while((ch=getchar())!='\n')
	{
		if(ch >='w'&&ch<='z')
		{
			n=ch-'v';
			sum+=n;
		}
		else if(ch>='a'&&ch<='o')
		{
			n=ch-'a'+1;
			if(n%3==0)
			{
				n=3;
			}
			else
			 n=n%3;
			sum+=n;
		}
		else if(ch>='t'&&ch<='v')
		{
			n=ch-'s';
			sum+=n;
		}
		else if(ch>='p'&&ch<='s')
		{
			n=ch-'o';
			sum+=n;
		}
		else
		{
			n=1;
			sum+=n;
		}
	}if(n!=0)
	printf("%d",sum);
	else
	printf("0");
}