#include <fstream>
#include <iostream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main(){

    char T[100001];
    long p=0;
    long lit=0, cuv=1;

    f.getline(T,100000);
    while (((T[p]<'a')||(T[p]>'z'))&&((T[p]<'A')||(T[p]>'Z'))){
        p++;
    }

    for (long i=p+1;i<=strlen(T);i++){
        if (((T[i]>='a')&&(T[i]<='z'))||((T[i]>='A')&&(T[i]<='Z')))
            lit++;
        if (T[i]==' ')
            cuv++;
        if (T[i]=='-')
            cuv++;
    }

    g<<lit/cuv<<"\n";
    g.close();

    return 0;
}