#include <bits/stdc++.h>
using namespace std;
int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
  string s;
  int litere=0,cuv=0;
  fin>>s;
  int n=s.size();
  for(int i=0;i<n;i++)
  {
      if((s[i]>='a' && s[i]<='z') || (s[i]>='A'&& s[i]<='Z'))
         {
             for(int j=1;j<n;j++)
                {
                    if((s[j]>='a'&& s[j]<='z')|| (s[j]>='A'&&s[j]<='Z'))
                    {
                        litere++;
                    }
                    else
                    {
                        i=j;
                        cuv++;
                        break;
                    }
                }
         }
  }
  if(cuv!=0)
    fout<<litere/cuv;
    else
        fout<<litere;
}