#include<fstream.h>
#include<string.h>
#include<ctype.h>
int main(void)
{	char text[10000];
	int l,i,nr,lim,cuv,avg;
	ifstream in("text.in");
	in.getline(text,10000);
	in.close();
	l=strlen(text);
	nr=0;lim=0;cuv=0;
	for(i=1;i<=l-2;i++)
	{	if((isalpha(text[i])==1))nr=nr+1;
		if((isalpha(text[i])==1)&&(lim==0))
		{	lim=1;
			cuv++;
		}
		if((isalpha(text[i])==0))lim=0;
	}
	avg=nr/cuv;
	ofstream out("text.out");
	out<<avg;
	out.close();
	return 0;
}