# include <iostream.h>
# include <fstream.h>
# include <string.h>
int i,nr1,nr2;
char s[256];
int main()
{
int i,nr1,nr2;
char s[256];
ifstream f("text.in");
ofstream g("text.out");
f.get(s,256);
nr1=0;
nr2=0;
if((s[0]>='a' && s[0]<='z') || (s[0]>='A' && s[0]<='Z'))
	nr2=1;
for(i=0;i<strlen(s);i++)
  if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
    nr1++;
  else
	if((s[i+1]>='a' && s[i+1]<='z') || (s[i+1]>='A' && s[i+1]<='Z') && (s[i+2]>='a' && s[i+2]<='z') || (s[i+2]>='A' && s[i+2]<='Z'))  
	   nr2++;
g<<nr1/nr2;
f.close();
g.close();
return 0;
}