#include<iostream.h>
#include<fstream.h>
char x,y;
int main()
{
char a[20000];
int nrc,lcuv,i;
ifstream f("text.in");
ofstream g("text.out");
f.get(x);
i=1;
lcuv=nrc=0;
while (!f.eof())
	{
	while ((x>='a'&&x<='z')||(x>='A'&&x<='Z')&&(!f.eof()))
		{
		y=x;
		a[i++]=x;
		f.get(x);
		}
	if (!(x>='a'&&x<='z')&&!(x>='A'&&x<='Z')&&((y>='a'&&y<='z')||(y>='A'&&y<='Z')))
		{
		a[i++]='|';
		y=x;
		}
	while (!(x>='a'&&x<='z')&&!(x>='A'&&x<='Z')&&(!f.eof()))
		f.get(x);
	}
i=1;
while ((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z')||a[i]=='|')
{
	if ((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z')) lcuv++;
	else nrc++;
	i++;
	}
g<<lcuv/nrc;
f.close();
g.close();
return 0;
}