# include <fstream>
# include <string>
using namespace std;
int main(void){ ifstream f("text.in"); 
				ofstream f1("text.out");
	int c1=0,l=0;
	char c,d='#';
	while(!f.eof()){
		if((c>='a' && c<='z') || (c>='A' && c<='Z')){
			l++;
			if(d<'A'||(d>'Z' && d<'a')||d>'z' || d==' ')
				c1++;
		}
		d=c;
	}
	f1<<(l/c1);
	return 0;
	f.close();
	f1.close();
}