#include<iostream>
#include<fstream>
using namespace std;
long long nrl,nrcuv;
int main(void)
{
	char ch,chp='9';
	
	fstream f("text.in",ios::in), g("text.out",ios::out);
	while (f>>noskipws>>ch)
	{
		if ((int(ch)>=65 && int(ch)<=90)||(int(ch)>=97 && int(ch)<=122))
		{
			
				nrl++;
		}
		else
		{
			if((int(chp)>=65 && int(chp)<=90)||(int(chp)>=97 && int(chp)<=122))
				nrcuv++;
		}
		chp=ch;
	}

	g<<nrl/nrcuv;
}