#include <cstdio>
#include <cmath>

int main() {
	FILE *f,*g;
	f = fopen("text.in","r");
	g = fopen("text.out","w");
	long int nc=0,tw=0; //tw-szavak szama, nc-betuk szama
	char c;
	bool inword = false;
	fscanf(f,"%c",&c);
	while (c!=EOF) {

		if ((c>64 && c<91)||(c>96 && c<123)) {
			nc++;
			inword = true;	
		}
		else if (inword)
		{
			tw++;
			inword = false;
		}
		c = fgetc(f);
	}
	if (inword) tw++;
	fprintf(g,"%d",(int)(nc/tw));
	
	
	fclose(f);
	fclose(g);
	return 0;
}