#include<fstream>
#include<string.h>
#include<iostream>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main()
{

int lung,lit,nulit=0,rez,i;
char prop[100000];
f.get(prop,100000);
lung=strlen(prop);
lit=0;
if((prop[0]>=65 && prop[0]<=90) || (prop[0]>=97 && prop[i]<=122))
        nulit=1;
       //g<<"nulit: "<<nulit<<endl;
for(int i=0;i<lung;i++)
    {
        if((prop[i]>=65 && prop[i]<=90) || (prop[i]>=97 && prop[i]<=122))
        lit=lit+1;
      else
          if((prop[i]==32 && prop[i+1]!=45 && prop[i-1]!=45) && prop[i+1]!=32 && prop[i-1]!=32 || prop[i]==45) //) || (prop[i]>=91 && prop[i]<=96) || (prop[i]>=123 && prop[i]<=126))
            nulit=nulit+1;
    }
/*
g<<prop<<endl;
g<<lung<<endl;
g<<"litere: "<<lit<<endl;
g<<"spatii sau linii: "<<nulit<<endl;*/
rez=lit/nulit;
g<<rez<<endl;

}