#include<stdio.h>
char c;
int n,k,med;
int main()
{
	FILE *f = fopen("text.in","r");
	fscanf(f,"%c",&c);
	if(((c>=65)&&(c<=90))||((c>=97)&&(c<=122)))
		{
			n++;
		}
		else
				k++;
	while(!feof(f))
	{
		fscanf(f,"%c",&c);
		if(((c>=65)&&(c<=90))||((c>=97)&&(c<=122)))
		{
			n++;
		}
		else
			if((c==' ')||(c=='-'))
				k++;
	}
	fclose(f);
	if(k==0)
		k=1;
	med=n/k;
	FILE *g = fopen("text.out","w");
	fprintf(g,"%d",med);
	fclose(g);
	return 0;
}