#include<fstream>
#include<iostream>
#include<string.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char v[100000000];
int main()
{
	char a='1',b,a1=0;
	fin.get(v,10000000);
	int x=0,y=0;
	while(v[a1])
	{
		a1++;
		a=v[a1];
		if((a>='a' and a<='z') or (a>='A' and a<='Z')) x++;
		else if((b>='a' and b<='z') or (b>='A' and b<='Z')) y++;
		b=a;
	}
	fout<<x/y;
}