#include<cstdio>
#include<string>

const int N=1<<30;

char s[N];

int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	/*gets(s);
	long long n=strlen(s)-1,nrc=0,lg=0;
	bool cuvant=true;
	for (int i=0;i<=n;i++)
	{
		int x=(int)s[i];
		if ((x>=65 && x<=90) || (x>=97 && x<=122))
		{
			lg++;
			if (cuvant)
				nrc++;
			cuvant=false;
		}
		else
			cuvant=true;
	}*/
	char c;
	bool cuvant=true;
	long long lg=0,nrc=0;
	while (scanf("%c",&c)!=0)
	{
		int x=(int)c;
		if ((x>=65 && x<=90) || (x>=97 && x<=122))
		{
			lg++;
			if (cuvant)
				nrc++;
			cuvant=false;
		}
		else
			cuvant=true;
		scanf("%c",&c);
	}
	printf("%lld",lg/nrc);
	return 0;
}