#include<fstream.h>
#include<string.h>
#define input "text.in"
#define output "text.out"


int main()
	{
	ifstream fin(input);
	char b;
	int s,n,i,ant=0,x;
	s=0;
	while( !fin.eof() )
		{
		fin>>b;
		if(b>=65&&b<=90||b>=97&&b<=122)
			{
			n++;
			ant=1;
			}
		else
			if(ant)
				{
				s++;
				ant=0;
				}
		}
	ofstream fout(output);
	fout<<n/s;
	return 0;
	}