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