#include<fstream.h>
int k,cuv;
int main()
{ifstream f("text.in");
ofstream g("text.out");
char c,c2;
f.get(c);
if(((c>='a')&&(c<='z'))||((c>='A')&&(c<='Z'))) k++;
while(!f.eof())
  {f.get(c2);
   if(((c2>='a')&&(c2<='z'))||((c2>='A')&&(c2<='Z'))) k++;
    else if(((c>='a')&&(c<='z'))||((c>='A')&&(c<='Z'))) cuv++;
   c=c2;
  }
f.close();
if((!cuv)&&(!k)) g<<0<<'\n';
  else if(!cuv) g<<k<<'\n'; 
   else g<<k/cuv<<'\n';
g.close();
return 0;
}