#include <bits/stdc++.h>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
    char s[300000];
    int Word=0,Count=0;
    while(in>>s)
    {
        bool ok=0;
       for(int i=0;i<=strlen(s);i++){
        if(isalpha(s[i])){
            Count++;ok=1;
        }
        else{
           if(ok){
            ok=0;Word++;

           }
        }
       }

    }
    out<<Count/Word;
}