#include<iostream>
#include<cstring>
#include<fstream>
using namespace std;
int const MAX = 1024 * 1024 + 7;
char s[MAX];

int main()
{
	int i,sr,k=0,z=1;
	ifstream g("text.in");
	ofstream f("text.out");
	g.get(s, MAX - 1);
	sr = strlen(s);
	for (i = 0; i < sr; i++)
	{
		if (isalpha(s[i]) || isdigit(s[i]))
			k++;
	}
	for (i = 0; i < sr; i++)
	if (s[i] == 32)
		z++;
	f << k / z;
}