#include<stdio.h>
#include<iostream>
#include<string>

using namespace std;
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	
	int nr,a,b;
	char s[1025], *p,  aux[1025];
	cin.get(s,100);
	aux[0]=0;
	a=0;
	nr=0;
	p=strtok(s," ,.-;:!?01234\"\'56789");
	while(p)
	{
		nr++;
		a=a+strlen(p);
		p=strtok(NULL," ,.-;:!?01234\"\'56789"); 
		
	}
	nr=a/nr;
	printf("%d", nr);
	return 0;
	
}