#include<iostream>
#include<cstdio>
#include<cstring>

using namespace std;

int main() { int c; string a; cin>>a;

	for(int i=0;i<a.length();i++)
	{
		if(a[i]=='a'||a[i]=='d'||a[i]=='g'||a[i]=='j'||a[i]=='t'||
		a[i]=='m'||a[i]=='p'||a[i]=='w')c+=1;
		
if
 (a[i]=='b'||a[i]=='e'||a[i]=='h'||a[i]=='k'||a[i]=='u'||
		a[i]=='n'||a[i]=='q'||a[i]=='x')c+=2;
		
		if(a[i]=='c'||a[i]=='f'||a[i]=='i'||a[i]=='l'||a[i]=='v'||
		a[i]=='o'||a[i]=='r'||a[i]=='y')c+=3;
		
		if(a[i]=='s'||a[i]=='z')c+=4;
		
	if(a[i]==' ')c+=1;
	}

cout<<c;
return 0;

} //输入：i have a dream 输出：3