#include<fstream>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");
char x[10005];
int contor1,contor2,q,i;
int main()
{
	i=0;
	while(f.get(x[i]))
	{
		
 		if( x[i] >= 'a' && x[i] <= 'z' )
		{
			contor1++;
			q=1;
		}			
          else
        if( x[i] >= 'A' && x[i] <= 'Z' )
		{
			contor1++;
			q=1;
		}
		
		else
			if(q==1)
		 contor2++;
			
			
			i++;
	}
	if((x[i-1]=='!'||x[i-1]=='-'||x[i-1]==','||x[i-1]=='?'||x[i-1]=='.')&&x[i]==0)
		contor2--;
	
	
	g<<contor1/contor2;
	
	f.close();
	g.close();
	return 0;
}