#include <stdio.h>

char c;
int l,n;

int main() {
	
	FILE *f = fopen("text.in","r");
	FILE *g = fopen("text.out","w");
	
	while (fscanf(f,"%c",&c)!=EOF) {
		if ((c>='A' && c<='Z') || (c>='a' && c<='z')) {
			l++;
			while (fscanf(f,"%c",&c)!=EOF && ((c>='A' && c<='Z') || (c>='a' && c<='z')))
					l++;
			n++;
		}
	}
	
	fprintf(g,"%d",l/n);
	
	fclose(f);
	fclose(g);
	
	return 0;
}