#include<cstdio>
long long l,c;
void citire()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	char s[2];
	scanf("%c",&s[1]);
	if ((s[1]>='a'&&s[1]<='z')||(s[1]>='A'&&s[1]<='Z'))
		++l;
	while (scanf("%c",&s[0])!=EOF)
	{
		if ((s[0]>='a'&&s[0]<='z')||(s[0]>='A'&&s[0]<='Z'))
			++l;
		else
			if ((s[1]>='a'&&s[1]<='z')||(s[1]>='A'&&s[1]<='Z'))
				++c;
		s[1]=s[0];
	}
	if (c)
	printf("%lld",l/c);
	else printf("0");
}
int main()
{
	citire();
	return 0;
}