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

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    string v;
    getline(f,v);
    int nrcuv=0,nrlitere=0;
    for(int i=0;i<v.size();i++){
        if( (i==0 && ( (v[i]>='a' && v[i]<='z') || ((v[i]>='A' && v[i]<='Z') ) ) || ((v[i-1] == ' ' || v[i-1] == '-')
        && (v[i]>='a' && v[i]<='z') || ((v[i]>='A' && v[i]<='Z') ))))
        nrcuv++;
        if((v[i]>='a' && v[i]<='z') || ((v[i]>='A' && v[i]<='Z') ))
        nrlitere++;
    }
    cout <<  nrlitere / max(nrcuv,1) ;
    return 0;
}