#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
char s[1000];
int n, i, litere, cuvinte;
ifstream fin("text.in");
ofstream fout("text.out");

int elitera(char c)
{
    if ( (c>='A' && c<='Z') || (c>='a' && c<='z') )
        return 1;

    return 0;
}

int main ()
{

    fin.get(s,1000);
    n=strlen(s);

    i=0;
    while(i<n)
    {
        if (i<n && elitera(s[i]))
        {
            cuvinte++;
            litere++;
            i++;
        }
        while(i<n && elitera(s[i]))
        {
            litere++;
            i++;
        }

        while(i<n && !elitera(s[i]))
        {
            i++;
        }

    }
    if(!cuvinte)
        fout<<0;
    else
        fout<<litere/cuvinte;

    return 0;
}