#include <stdio.h>
int main()
{
	freopen("text.in","r",stdin) ;
	freopen("text.out","w",stdin) ;
	char c ;
	int cuv=0,lit=0;
	while ((c=fgetc(f))!=EOF)
	{
		if (c>='a'&&c<='z'||c>='A'&&c<='Z')
		{
			cuv++;
			while(c>='a'&&c<='z'||c>='A'&&c<='Z')
			{
				litere++;
				c=fgetc(f);
			}
		}
	}
	printf("%d",lit/cuv) ;
}