#include <fstream>   
using namespace std;   
  
char ch;   
long long nrcuv, nrtotal;   
  
int main()   
{   
    long i, j;   
    ifstream fin("text.in");   
       
    while ( 1 )   
    {    
       ch = fin.get();   
       if ( ch == EOF) break;   
       if ( ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z')   
       {   
           nrtotal++;   
           nrcuv++;   
           while (ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z')   
           {   
               ch = fin.get();   
               if (ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z')   
               nrtotal++;   
           }   
      }   
    }               
           
    fin.close();   
    ofstream fout("text.out");   
    if ( nrcuv == 0 || nrtotal == 0) fout << '0' << '\n';   
    else  
    fout << nrtotal / nrcuv << '\n';   
    fout.close();   
    return 0;   
}