#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
int n,i,nrlitere=0,nrcuvinte=0;
string s;
int main()
{
    ifstream f ("text.in");
    ofstream g ("text.out");
    getline (f,s);
    n=s.size();
    for (i=0;i<n;i++)
    {
        if (s[i]>=97 && s[i]<=122) nrlitere++;
        else if (s[i]>=65 && s[i]<=90) nrlitere++;
        else if (s[i-1]>=97 && s[i-1]<=122) nrcuvinte++;
        else if (s[i-1]>=65 && s[i-1]<=90) nrcuvinte++;
    }
    g<<nrlitere/nrcuvinte;
}