#include <string>
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int i,p,l,x;
char s[1048576];
int main ()
{
	f.get(s,1048577);
	x=strlen(s);
	for (i=1;i<x;i++)
	{
		if ((s[i]>122 || s[i]<65 || (s[i]>90 && s[i]<97)) && ((s[i-1]>=65 && s[i-1]<=90) || (s[i-1]>=97 && s[i-1]<=122)))
			p++;
		if ((s[i]>=65 && s[i]<=90) || (s[i]>=97 && s[i]<=122))
			l++;
	}
	if ((s[x-1]>=65 && s[x-1]<=90) || (s[x-1]>=97 && s[x-1]<=122))
		p++;
	g<<l/p;
	return 0;
	f.close();
	g.close();
}