#include<stdio.h>
#define N 1000005
char s[N];
void citire()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	fgets(s,N-1, stdin);
}
void sir()
{
	long long c=0,l=0;
	for (int i=0; s[i]; ++i)
	{
		if ((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
		{
			++l;
			if (s[i+1]&&!((s[i+1]>='a'&&s[i+1]<='z')||(s[i+1]>='A'&&s[i+1]<='Z')))
			{
				++c;
			}
			else
				if (!s[i+1])
					++c;
		}
	}
	printf("%lld",l/c);
}
int main()
{
	citire();
	sir();
	return 0;
}