#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    int k=0, cuv, ok, rez, c1;
    char c;
    cuv=1;
    c1 = 0;
    c1= ' ';
    ifstream f("text.in");
    ofstream g("text.out");
    while(!f.eof())
    {
        c=f.get();
        ok=1;
        if(c=='!' || c=='?' || c==',' || c==';' || c==':' || c=='.' || c=='<' || c=='>' || c=='"' || c==' ' || c=='(' || c==')' || c=='+' || c=='*' || c=='@' || (c<=9 && c>=0))
            ok=0;
        if(ok==1)
            k++;
        if(c==' ' || c=='-')
            cuv++;

    }
    rez=k/cuv;
    g<<rez;
    f.close();
    g.close();
}