#include<iostream>
#include<fstream>
#include<cstring>
using namespace std;
int n,nrcuvinte,nrlitere;
int main()
{
    ifstream cin("text.in");
    ofstream cout("text.out");
    char s[1200005];
    while(!cin.eof())
    {
        cin.getline(s,1200005);
        n=strlen(s);
        for(int i=0;i<n;i++){
            if((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z')){
                 nrcuvinte++;
                 while((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z')){
                    nrlitere++;
                    i++;
                 }
            }
        }
    }
    cout<<nrlitere/nrcuvinte;
}