#include <fstream>

using namespace std;

ifstream in ("text.in");
ofstream out ("text.out");

int main()
{
    char c;
    int cntlit=0,cntcuv=0;
    char aux;
    aux='1';
    while (in.get(c))
    {
      if ((c>='a'&&c<='z')||(c<='Z'&&c>='A'))
      {
        cntlit++;
        if ((aux<'a'||aux>'z')&&(aux<'A'||aux>'Z'))
            cntcuv++;
      }
      aux=char(c);
    }
    out<<cntlit/cntcuv;
    return 0;
}