#include <cstdio>
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char c;
char ok;
int nr1,nr2;
int verificare(char a)
{
      if((a>='a' && a<='z') || (a>='A' && a<='Z') )
        return 1;
    return 0;

}
int main()
{

    nr1=0;
    nr2=0;
    ok=0;
    while(fin>>c)
    {
       if (verificare(c))
            nr1++;
        if (ok!=0)
         {  if(!verificare(c) && verificare(ok))
                nr2++;
         }
         ok=c;
    }
   fout<<nr1/nr2%10;
    return 0;
}