#include<fstream.h>
ifstream f("text.in");
ofstream g("text.out");
main()
{
	long long n1=0,n2=0,c,b;
	char a;
	c=0;
	while(!f.eof())
	{
		b=c;
		
		a=f.get();
		
		c=a;
		if(((c>=65)&&(c<=90))||((c>=97)&&(c<=122))) n1++;
		else if(((b>=65)&&(b<=90))||((b>=97)&&(b<=122)))n2++;
	}
	if(((c>=65)&&(c<=90))||((c>=97)&&(c<=122))) n2++;
	if(n2==0) g<<n1;
		else
	g<<n1/n2;
	
}