//P1765 手机
#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<queue>
#include<algorithm>
#define ll long long
using namespace std;
int sum[27]={0,
1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,4,1,2,3,1,2,3,4};
int main(){
	char a;
	int ans=0;
	while(scanf("%c",&a)!=EOF){
	//	if(a=='\n')break;
		if(a==' '){ans++;continue;}
		ans+=sum[a-'a'+1];
	}
	printf("%d",ans);
	return 0;
}