#include <fstream>
using namespace std;
int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
     int cuv=0,lit=0;
     char x,y;
     fin>>x;
     if(isalpha(x))
        lit++;
     while(fin.get(y))
     {    if(isalpha(y))
            lit++;
          else if(isalpha(x))
                 cuv++;

     x=y;
     }


fout<<lit/cuv;
fin.close();
fout.close();

    return 0;
}