#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;

ifstream in("text.in");
ofstream out("text.out");

int main()
{
    char a[1024];
    int nrlit = 0, nrcuv = 0,cuvnou = 0;
    in.getline(a, 1024);
    int n = strlen(a);
    for(int i = 0; i<n;i++){
        if(('a'<=a[i] && a[i] <= 'z') ||('A'<=a[i] && a[i] <= 'Z')){
            nrlit++;
            if(cuvnou == 0){
                cuvnou = 1;
                nrcuv++;
            }
        }
        else
            cuvnou = 0;

    }
    out<<nrlit/nrcuv;
    return 0;
}