#include<fstream>
#include<cstring>
using namespace std; 
ifstream in("text.in");
ofstream out("text.out");
 int main()
{int nrcuv,nrlit,i,n;
char s[1100000],d=26;
in.get(s,1100000,d);
in.get();
n=strlen(s);
nrcuv=nrlit=0;
if(isalpha(s[0]))
	{
	nrlit++;
	nrcuv++;
}
	for(i=1;i<n;i++)
	{
	if(isalpha(s[i]))
	{
	nrlit++;
	if(!isalpha (s[i-1])) nrcuv++;
	}
	}
    out<<nrlit/nrcuv;
return 0;
}