#include <iostream>
#include <cstring>
#include <cctype>
#include <fstream>

using namespace std;

int main()
{ char s[10000], *p;
    int nr=0,  sh=1;
    ifstream f("text.in");
    ofstream g("text.out");
    f.get(s,10000);


    for (p=s;*p;p++) {if(isalpha(*p)) nr++;
                    else if(*p==' '&&*(p+1)!=isdigit(*(p+1))) sh++;}
    g<<nr/sh;




    return 0;
}