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


int litera(char chch){

    if((chch>='a' && chch<='z')||(chch>='A' && chch<='Z')) return 1;
    return 0;
}
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");


    int k=0,cuv=0,litere=0,i;

    char charchar;



    while(f.get(charchar))
    {

        if(litera(charchar))
        {
            litere++;

            k++;

            if(k==1)
                {cuv++;}
        }
        else k=0;
    }


    if(cuv!=0)
        g<<litere/cuv<<"\n";
    else g<<"0"<<"\n";



    return 0;
}