#include<stdio.h>
#include<string.h>
char a[10000];
int main()
{
unsigned long n=0,l=0,c=0,l1=0,i=0;
FILE *f=fopen("text.in","r");
FILE *g=fopen("text.out","w");
fgets(a,10000,f);
n=strlen(a);
while(i<n)
	{
	l1=l;
	while(i<n && (a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z'))
		{
		l++;
		i++;
		}
	if(l>l1)
		c++;
	i++;
	}
if(c>0)
	fprintf(g,"%ld\n",l/c);
else
	fprintf(g,"%d\n",0);

return 0;
}