#include <stdio.h>
int n,i,lit,j,cuv;
char x[999999999];
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	i=0;
        lit=0;
	do
	{
		i=i+1;
		scanf("%c",&x[i]);
	}
	while(x[i]!='/0');
        j=i;
	for(i=1;i<=j;i++)
	 {
			if ((x[i]>='a' && x[i]<='z') || (x[i]>='A' && x[i]<='B'))
			lit=lit+1;
			else
		if ((x[i+1]>='a' && x[i+1]<='z') || (x[i+1]>='A' && x[i+1]<='B'))
			cuv=cuv+1;
         }
   printf("%d",lit/cuv);
   return 0;
}