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

int Literza(char ch)
{
    int litera;

    litera=0;

    if( (ch >='a' && ch<='z') || (ch>='A' && ch<='Z') ) litera = 1;
    return litera;
}
int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");

    char c,b='?';

    int nrcuv=0,nrlit=0;

    while(fin.get(c))
    {
        if(Literza(c)==1) nrlit++;

        if(Literza(c)==1 && Literza(b)==0) nrcuv++;

        b=c;
    }

    fout<<nrlit/nrcuv;
    return 0;
}