#include<iostream>
#include<fstream>
#include<cstring>
using namespace std;

ifstream f("text.in");
ofstream g("text.out");
 
int main()
{	
	char t[1000];
	int pa, nr, i, n_cuv_text=0;
	
	for(i=0;i<=strlen(t);i++)
	  if(t[i]>='a' && t[i]<='z' || t[i]>='A' && t[i]<='Z')
	     n_cuv_text++;
	  
	for(i=1;i<=strlen(t)-1;i++)
	  if(strchr("qwertyuioplkjhgfdsazxcvbnmMNBVCXZASDFGHJKLPOIUYTREWQ",t[i-1])==NULL)
	    if(strchr("qwertyuioplkjhgfdsazxcvbnmMNBVCXZASDFGHJKLPOIUYTREWQ",t[i])!=NULL)
				   nr++;
	
	pa=n_cuv_text/nr;			   
				   
	g<<pa;
	
	f.close();
	g.close();   
	return 0;
}