#include <iostream>
#include <fstream>
using namespace std;
ifstream fisin("text.in");
ofstream fisout("text.out");

int main()
{
    char x,y;y='*';long long int cuv=0,lit=0;char a=' ';bool fact=true;
    while(fisin.get(x))
    {
        if(((x>='A' && x<='Z') || (x>='a' && x<='z')) && fact)
        {
            cuv++;fact=false;//fisout<<y<<x<<endl;
        }
        if((x>='A' && x<='Z') || (x>='a' && x<='z'))
        {
            lit++;
        }
        else
        {
            fact=true;
        }
    }
    fisout<<lit/cuv;
}