#include<fstream>
#include<string>
using namespace std;
char sir[100001];
int main()
{ifstream f ("text.in");
 f.get(sir,1000001);
 f.get(); unsigned int k=0, nrc=0;
 for(unsigned int i=0;i<strlen(sir);i++)
	 if((sir[i]>='a'&&sir[i]<='z')||(sir[i]>='A'&&sir[i]<='Z')) {
		 nrc++;
		 if((sir[i-1]<'a'||sir[i-1]>'z')&&(sir[i-1]<'A'||sir[i-1]>'Z'))
			 k++;}
 ofstream g ("text.out");
 g<<nrc/k;
 g.close();
 f.close();
 return 0;}