#include<fstream.h>
#include<cstring>

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;
}