#include<stdio.h>
#include<fstream.h>
#include<string.h>

int estecaracter(char ch)
{
	if( (ch>='a') &&(ch<='z')) return 1;
	if( (ch>='A') &&(ch<='Z')) return 1;
	return 0;

}
int main(void)
{
	unsigned long nc=0,ncuv=0,OK;
	char ch;
	FILE *in;
	in = fopen("text.in", "r");
	OK=0;
	do
	{
		ch =fgetc(in);
		if(estecaracter(ch))
		{	OK=1;
			nc++;
		}
		else if(OK==1) {	ncuv++;
					OK=0;
			       }
	} while (ch != EOF);
	ofstream out("text.out");
	out<<(int)nc/ncuv;
	out.close();
	return 0;
}