#include<fstream>
#include<string.h>
using namespace std; 
ifstream in("text.in"); 
ofstream out("text.out"); 
int main ()
{ 
	char s[1000]; 
	in.getline(s,1000);
	unsigned short p=0,k=0; 
	bool cor=0; 
	int i;
	for(i=1;i<strlen(s);i++) 
	{
		if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')) 
	{		p++; 
		if(cor==0) 
		 {	k++; 
		    cor=1; 
		 } 
	} 
     else
        cor=0;
	}

out<<p/k; 
}