#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
 ifstream in("text.in");
 ofstream out("text.out");
char a;

int main()
{ char s;
 bool ok = false;
int cuvinte=0, caractere=0;
while(in.get(s))
{
    if(s>='a'&&s<='z' || s>='A'&&s<='Z')
        // e o litera
          {++ caractere;

              if (ok == false ) {ok = true;
                                    ++cuvinte;
                                 }
          }
       else {
        ok = false;
            }
}

out << caractere/cuvinte;



    return 0;
}