#include<fstream>
#include<string.h>
#include<iostream>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main()
{

int lung,lit,nulit,rez;
char prop[10000];
f.get(prop,10000);
lung=strlen(prop);
lit=0;nulit=0;
for(int i=0;i<lung;i++)
{
      if((prop[i]>=65 && prop[i]<=90) || (prop[i]>=97 && prop[i]<=122)){
        lit=lit+1;



    if(prop[i-1]==' ' || prop[i-1]=='-')
        nulit=nulit+1;}


}
/*g<<prop<<endl;
g<<lung<<endl;
g<<"litere: "<<lit<<endl;
g<<"spatii sau linii: "<<nulit<<endl;*/
rez=lit/nulit;
g<<rez<<endl;

}