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

int i,s,nr;
char ch,ch2=' ';
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	
	while (!feof(stdin))
	{
		scanf("%c",&ch);
		if ((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'))
			s++;
		else if ((ch2>='a'&&ch2<='z')||(ch2>='A'&&ch2<='Z')) nr++;
		ch2=ch;
	}
	printf("%d\n",s/nr);
	return 0;
}