#include <stdio.h>
#include <string.h>
#include <ctype.h>
FILE *f=fopen("text.in","r"), *g=fopen("text.out","w");
int main()
{
char a;
long er,p=0,nrcuv=0,lungcuv=0;
er=fscanf(f,"%c",&a);
while (er!=EOF)
{
if ((p) && (!isalpha(a))) nrcuv++;
if (isalpha(a))
	{
	lungcuv++;
	p=1;
	}
else p=0;
er=fscanf(f,"%c",&a);
}
fprintf(g,"%d\n",int(lungcuv/nrcuv));
fcloseall();
return 0;
}