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

ifstream f("text.in");
ofstream g("text.out");

char sir[256];
int i;

int litere(char x)
{
	if(x>='A'&& x<='Z' || x>='a' && x<='z') return 1;
		else return 0;
}
int main()
{
    f.get(sir,255);
    int s=0, c=1;
    for(i=0;i<(strlen(sir));i++)
	{
		if(litere(sir[i])) s=s+1;
		else
			if(litere(sir[i+1])) c=c+1;
	}
	g<<s/c;
    return 0;
}