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

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

int main()
{
    char a[2024];
    int nrlit = 0, nrcuv = 0, i = 0 ;
    in.getline(a, 2024);
    int n = strlen(a);
    while(i<n){
        if(('a'<=a[i] && a[i] <= 'z') || ('A'<=a[i] && a[i] <= 'Z')){
            nrcuv++;
            while((i<n)&&(('a'<=a[i] && a[i] <= 'z') || ('A'<=a[i] && a[i] <= 'Z')))
                {
                nrlit++;
                i++;
            }
        }
    i++;
    }
    out<<nrlit/nrcuv;
    return 0;
}