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

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

int main()
{

int lung,lit,nulit,rez;
char prop[10000];
f.get(prop,10000);
lung=strlen(prop);
lit=0;nulit=0;
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]==45) //) || (prop[i]>=91 && prop[i]<=96) || (prop[i]>=123 && prop[i]<=126))
            nulit=nulit+1;

}
//g<<prop<<endl;
//g<<lung<<endl;
//g<<lit<<endl;
//g<<nulit<<endl;
rez=lit/nulit;
g<<rez<<endl;

}