#include<fstream>
#include<string.h>
#define dmax 1048580
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
char sir[dmax];
long int l,cuv=0,lit=0,n=0;
int main()
{	long int i;
	in.getline(sir,dmax,'\n');
	l=strlen(sir);
	for(i=0;i<l;i++)
	{	if( ((sir[i]>='a')&&(sir[i]<='z')) || ((sir[i]>='A')&&(sir[i]<='Z')) )
		{	lit++;
			if(n==0)
				cuv++;
			n=1;
		}
		else n=0;
	}
	in.close();	
	//out<<lit<<" "<<cuv;
	out<<lit/cuv;
	out.close();
	return 0;
}