#include<fstream>
#include<iostream>
#include<string.h>
ifstream f("text.in");
ofstream g("text.out");
int main()
{
	char sir[255], *p;
	int nr, i, nrTotal,lm;
	nr=nrTotal=0;

	f.get(sir,255);
	
	for(i=0;i<strlen(sir);i++)
		if((sir[i]>='a' && sir[i]<='z') || (sir[i]>='A' && sir[i]<='Z'))
			nrTotal++;

	p=strtok(sir,"-, !.");
	
	while(p)
	{
		nr++;
		p=strtok(NULL,"-, !.");
	}
	lm=nrTotal/nr;
	g<<lm;
return 0;
}