#include<fstream>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");
char b,c;
int contor1,contor2,q;
int main()
{
	
	while(f.get(c))
	{
		
 		if( c >= 'a' && c <= 'z' )
		{
			contor1++;
			q=1;
		}			
          else
        if( c >= 'A' && c <= 'Z' )
		{
			contor1++;
			q=1;
		}
		
		else
			if(q==1)
		 contor2++;
			
			b=c;
			
	}
	if((b<'A'||b>'z'))
		contor2--;
	
	
	g<<contor1/contor2;
	
	f.close();
	g.close();
	return 0;
}