#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

char x[2000005], cuv[101][101];

int k,l;

int main ()
{
	int i, t=0;
	k=0;
	l=0;
	f.getline(x, 2000000);
	int p=strlen(x);
	for(i=0; i<p; i++)
	{
		if(isalpha(x[i]) || isdigit(x[i]))
		{
			k++;
			t=0;
			while(isalpha(x[i]) || isdigit(x[i]))
			{

				l++;
				i++;
			}
		}
	}
	g<<l/k;
	//g<<k<<" "<<l;
}