#include <fstream>
#include <iostream>
using namespace std;
char c;
int ltotal,nrcuv,lcuv;

ifstream fin("text.in");
ofstream fout("text.out");

int main()
{
    while(fin.get(c)){
        if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')){
            lcuv++;
            ltotal++;
            //cout << c;
        }else{
            //cout << "\n";
            if(lcuv != 0){
                nrcuv++;
            }
            lcuv = 0;
        }
    }
    if(nrcuv == 0){
        fout << "0\n";
        return 0;
    }
    fout << ltotal/nrcuv << "\n";
    //cout << nrcuv << " : "<< ltotal << "\n";
    return 0;
}