#include <stdio.h>

int betuDb,betuElozo,szoDb;

int Betu(char c)
{	if ((96<c && c<123) || (64<c && c<91))
		return 1;
	return 0;
}

int main()
{	FILE *f=fopen("text.in","rt");
	char c;
	while (!feof(f))
	{	fscanf(f,"%c",&c);
		if (Betu(c))
		{	betuDb++;
			betuElozo=1;
		}
		else
		{	if (betuElozo)
				szoDb++;
			betuElozo=0;
		}
	}
	fclose(f);
	FILE *g=fopen("text.out","wt");
	fprintf(g,"%d",betuDb/szoDb);
	fclose(g);
}