#include<stdio.h>
#include<string.h>
char a[1000000];
unsigned long n,l,c,l1,i;
int main()
{
FILE *f=fopen("text.in","r");
FILE *g=fopen("text.out","w");
fgets(a,1000000,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++;
	}
fprintf(g,"%d\n",l/c);

return 0;
}