#include<fstream.h>
int isLetter(char c)
{
	if('a'<=c && c<='z' || 'A'<=c && c<='Z')
		return 1;
	return 0;
}
int main()
{
	char c1, c2;
	long nrcuv=0, nr=0, aux;
	ifstream f("text.in");
	ofstream g("text.out");
	c2=f.get();
	if(isLetter(c2))
	{
		++nr;
		++nrcuv;
	}
	while(c2!=EOF)
	{
		c1=c2;
		c2=f.get();
		if(isLetter(c2))
		{
			++nr;
			if(!isLetter(c1))
				++nrcuv;
		}
	}
	if(nrcuv==0)
		g<<0;
	else
	g<<nr/nrcuv;
	g.close();
	return 0;
}