#include<fstream.h>
#include<ctype.h>
char buf[30000];
int i,s,c;
main(){
	ifstream fi("text.in");
	ofstream fo("text.out");
	while(!fi.fail()) {
		memset(buf, 0, 30000);
		fi.getline(buf, 29999);
		for(i=1;!(buf[i]==0);++i)
			if (isalpha(buf[i])){
				++s;
				c+= !isalpha(buf[i-1]);
			}
	}
	fo<<(int)(s/c);
}