#include<stdio.h>
#include<string.h>
char arr[1000];
int main(){
	gets(arr);
	int l=strlen(arr);
	int sum=0;
	for(int i=0;i<l;i++){
		if(arr[i]=='b'||arr[i]=='e'||arr[i]=='h'||arr[i]=='k'||arr[i]=='n'||
		arr[i]=='q'||arr[i]=='u'||arr[i]=='x')
			sum+=2;
		else if(arr[i]=='a'||arr[i]=='d'||arr[i]=='g'||arr[i]=='j'||arr[i]=='m'||
		arr[i]=='p'||arr[i]=='t'||arr[i]=='w')
			sum+=1;
		else if(arr[i]=='c'||arr[i]=='f'||arr[i]=='i'||arr[i]=='l'||arr[i]=='o'||
		arr[i]=='r'||arr[i]=='v'||arr[i]=='y')
			sum+=3;
		else if(arr[i]=='z'||arr[i]=='s')
			sum+=4;
		else{
			sum+=1;
		}
	} 
	printf("%d",sum);
		return 0; 
}