#include<fstream>
#include <iomanip.h>
using namespace std; 
ifstream f ("text.in"); 
ofstream g ("text.out"); 
int i=1,ok,s,c=1;
char v;
int main ()
{while (!f.eof())
	{f>> resetiosflags (ios::skipws) >>v;
	if ((v>='A'&&v<='Z')||(v>='a'&&v<='z'))
		{s=s+1;ok=1;}
	else if ((v==' ' || v=='_' || v==',' || v=='(' || v==')' || v=='.' || v=='!' || v=='?' || v=='-' || v==';' || v==':')&&ok)
		{c=c+1;ok=0;}}
g<<(s)/c;
}