#include <cstdio>
using namespace std;
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()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    nr1=0;
    nr2=0;
    ok=0;
    while(scanf("%c",&c)>0)
    {
       if (verificare(c))
            nr1++;
        if (ok!=0)
         {  if(!verificare(c) && verificare(ok))
                nr2++;
         }
         ok=c;
    }
   printf("%d",nr1/nr2);
    return 0;
}