using namespace std;
int main()
{
	string a;
	getline(cin,a);
	int ans=0;
	for(int i=0; i<a.size(); i++)
	{
		if(a[i]==' '||a[i]=='a'||a[i]=='d'||a[i]=='g'||a[i]=='j'||a[i]=='m'||a[i]=='p'||a[i]=='t'||a[i]=='w')
		ans++;
		if(a[i]=='b'||a[i]=='e'||a[i]=='h'||a[i]=='k'||a[i]=='n'||a[i]=='q'||a[i]=='u'||a[i]=='x')
		ans+=2;
		if(a[i]=='c'||a[i]=='f'||a[i]=='i'||a[i]=='l'||a[i]=='o'||a[i]=='r'||a[i]=='v'||a[i]=='y')
		ans+=3;
		if(a[i]=='s'||a[i]=='z')
		ans+=4;
	}
	cout<<ans;
	return 0;
}