#include <iostream>
#include <algorithm>
#include <cmath>
#include <string>

using namespace std;

const int N = 4e5+10;

int res;

int main()
{
   string s;
   cin>>s;

   string p = "chuanzhi";

   for(int i=0,j=0;i<s.size();i++)
   {
       if(s[i] == p[j]) j++;
       else j = i-j+2;

       if(j == p.size())
       {
           res++;
           j = 0;
       }
   }
   cout<<res;

    return 0;

}