#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

int main(void)
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	int inword=0;
	double nr_cuv=0;
	double nr_litere=0;
	char ch;
	while((ch=getchar())!=EOF)
	{
		if((ch>='A' && ch<='Z') || (ch>='a' && ch<='z'))
		{
			inword=1;
			++nr_litere;
		}
		else
		{
			if(inword==1)
			{
				++nr_cuv;
				inword=0;
			}
		}
	}
	if(nr_cuv)
	{
		printf("%d",(int)(nr_litere/nr_cuv));
	}
	else
	{
		printf("0");
	}
	return 0;
}