#include <bits/stdc++.h>
using namespace std;
string prob="text";
ifstream in(prob+".in");
ofstream out(prob+".out");
int main(){
    int lit=0;
    int nrcuv=0;
    bool cuv=0;
    string s;
    while(getline(in,s)){
        s.push_back(' ');
        for(auto c:s){
        if((c>='a'&&c<='z')||(c>='A'&&c<='Z')){lit++;cuv=1;}
        else {nrcuv+=cuv;cuv=0;}
        }
    }
    out<<lit/nrcuv;
}