#include <stdio.h>
#include <string.h>
#include <ctype.h>
FILE *f=fopen("text.in","r"), *g=fopen("text.out","w");
int main()
{
char a[5000];
int p,x,b,i=0,nrcuv=0,lungcuv=0;
fgets(a,4999,f);
while (i<strlen(a))
{
p=0;
while (isalpha(a[i]))
	{
	p=1;
	lungcuv++;
	i++;
	}
if (p) nrcuv++;

i++;
}
fprintf(g,"%d\n",lungcuv/nrcuv);
fcloseall();
return 0;
}