#include<fstream.h>
#include<string.h>
ifstream f("text.in");
ofstream g("text.out");
char a[10000];
unsigned long n,l,c,l1,i;
int main()
{
f.getline(a,10000,NULL);
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++;
	}
g<<l/c<<'\n';
g.close();
return 0;
}