#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;

int main()
{ ifstream f("text.in");
  ofstream g("text.out");
  int i,cuv=0,lit=0;
  char s[250],v[]="~`!@#$%^&*()_-+=><.,?/\|;:(){}[]' ",b[250],*p,sep[]="~`!@#$%^&*_-+=><.,?/\|;:(){}[]' ";
  f.getline (s,250);
  for(i=0;i<strlen(s);i++)
  { if(strchr(sep,s[i])==0) lit++;

  }

 p=strtok(s,sep);

 while(p)
 {cuv++;


   p=strtok(NULL,sep);
 }
 g<<lit/cuv;

}