//Infoarena - Text

#include <iostream>

#include <fstream>

#include <string.h>

#include <stdio.h>

using namespace std;

char s[100000];

void citire(void)
{

    FILE* f;

    f=fopen("text.in","r");

    fgets(s,100000,f);

    fclose(f);

}

void prel(void)
{

    int i,nrc=0,nrl=0;

    for (i=0;i<strlen(s)-1;i++)

        {

            if ((int)s[i]>=65 && (int)s[i]<=90 || (int)s[i]>=97 && (int)s[i]<=112) nrl++;

            if ((int)s[i]>=65 && (int)s[i]<=90 || (int)s[i]>=97 && (int)s[i]<=112 && s[i+1]==' ') nrc++;

        }

    ofstream g("text.out");

    g<<nrl/nrc;

}

int main()
{

    citire();

    prel();


    return 0;
}