#include<iostream>
#include<cstring>
using namespace std;
string s;
int i,ans;
void check(){
	int re=i;
	if(s[i]=='c'&&(s[i+1]=='='||s[i+1]=='-')){i+=2;ans+=1;}
	if(s[i]=='d'&&s[i+1]=='z'&&s[i+2]=='='){i+=3;ans+=1;}
	if(s[i]=='d'&&((s[i+1]=='z'&&s[i+2]!='=')||s[i+1]=='-')){i+=2;ans+=1;}
	if((s[i]=='l'||s[i]=='n')&&s[i+1]=='j'){i+=2;ans+=1;}
	if((s[i]=='s'||s[i]=='z')&&s[i+1]=='='){i+=2;ans+=1;}
	if(re==i){i++;ans++;}
	//for(int j=re;j<=i-1;j++)cout<<s[j]<<" ";
	cout<<endl;
}
int main(){
	cin>>s; 
	i=0;
	ans=0;
	int l=s.length();
	while(i!=l)check();
	cout<<ans;
	return 0;
}