#include<fstream.h>
#include<string.h>
char *p,a[10000010];
long s=0,c=0,q,i;
int main()
{
ifstream f("text.in");
ofstream g("text.out");
f.get(a,10000000);
f.get();
q=strlen(a);
for(i=0;i<=q;i++)
	{
	if(a[i]>='a'&&a[i]<='z'||a[i]>='A'&&a[i]<='Z')
		{
		s++;
if( (a[i+1]<'A'||a[i+1]>'Z') && (a[i+1]<'a'||a[i+1]>'z') )  ;		
//if(a[i+1]<'A'||a[i+1]>'Z'&&a[i+1]<'a'||a[i+1]>'z')
		c++;
                }

	}
s=s/c;
g<<s;
return 0;
}