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