#include<fstream>
#include<string.h>
using namespace std;
ifstream fin("text.in");
	ofstream fout("text.out");
	char a,b;
	long int x,y;
	int main()
	{
		b=' ';
		while( fin.get(a) )
		{
			if(((65<=a)&&(a<=90))||((97<=a)&&(a<=122)))x++;
			else
			{
				if(((65<=b)&&(b<=90))||((97<=b)&&(b<=122)))y++;
			}
			b=a;
		}
		fout<<x/y;
		return 0;
	}