#include <iostream>
#include <cstdio>
#include <string.h>
#include <fstream>
using namespace std;
int main() 
{

    freopen("info.txt","r+", stdin);
    freopen("info.out.txt", "w", stdout);
	
	char S[]=" ,.()~!@#$%^&*{}\/:[]<>?!-=";
	char ch;
	char chante='a';
	int nr_cuv=-1;
	int suma_cif=0;


	ch=getchar();
	while(ch!=EOF)
	{
		if((ch==' '||ch=='-'||ch==','||ch=='.'||ch=='?'||ch=='!') && (chante!='-'||chante!=','||chante!='.'||chante!='?'||chante!='!'))	
				nr_cuv++;
		else	
			suma_cif++;
		chante=ch;
		ch=getchar();
	}
	cout<<suma_cif/nr_cuv;
return 0;
}