#include <stdio.h>

int main()
{
	FILE *f= fopen("text.in", "r");
	FILE *g= fopen("text.out", "w");

	char c;
	int s=0, nr=0, ok=0;

	while(!feof(f))
	{
		fscanf(f, "%c", &c);
		if((c >= 'a' && c<='z') || (c >= 'A' && c <= 'Z'))
		{
			s++;
			if(!ok)
			{
				ok=1;
				nr++;
			}
		}
		else if(ok)
		{
			ok=0;
		}
	}

	if(nr)
	{
		fprintf(g, "%d", s/nr);
	}
	else
	{
		fprintf(g,"0");
	}

	fclose(f);
	fclose(g);

	return 0;
}