#include<fstream.h>
#include<string.h>
#define D 64000
long x,i,n,nc=0,nl=0,k=0;
char s[D+1];
int main()
{ifstream f("text.in");
ofstream g("text.out");
 f.get(s,D+1); f.get();
 x=strlen(s);
 for(i=0;i<x;i++)
  if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')) nl++;
   else {nc++;
	 if(strchr("!?,:;.-1234567890""'' ",s[i-1])!=0) k++;}

 nc-=k;
 n=nl/nc;
 g<<n<<'\n';
 return 0;
}