#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream in("text.in");
    ofstream out("text.out");
    string s;
    int i,t=0,cuv=0;
    bool a=true;
    getline(in,s);
    if ((s[0]>='A'&&s[0]<='Z')||(s[0]>='a'&&s[0]<='z'))cuv=1;
    for (i=0;i<s.length();i++)
    {
         if ((s[i]>='A'&&s[i]<='Z')||(s[i]>='a'&&s[i]<='z'))
         {
             t++;
             a=true;
         }
         else if (a)
         {
             a=false;
             cuv++;
         }
    }
    out<<t/cuv;
}