#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream in;
    in.open("text.in");
    ofstream out;
    out.open("text.out");
    int nr = 0,nr_cuv = 0,ant = 0;
    char p;
    while (in.get(p)){
        int aux = (int)p;
        if((aux > 64 &&  aux <91) || (aux > 96 &&  aux <123)){
            nr++;
            if(ant < 65 ||  ant >122 || (ant >90 && ant <97)) nr_cuv++;
        }
        ant = aux;
    }
    out << nr / nr_cuv <<endl;
    return 0;
}