using namespace std;
#include<cstdio>
#include<cstring>
#define NMAX 2097200
char text[NMAX];
long long letter,space;
int litera(int i)
{
	char chs=text[i];
	if((('a'<=chs)&&(chs<='z'))||(('A'<=chs)&&(chs<='Z')))
		return 1;
	return 0;
}
void citire()
{
	freopen("text.in","r",stdin);
	fgets(text+1,NMAX,stdin);
}
void afisare()
{
	freopen("text.out","w",stdout);
	printf("%lld\n",1LL*letter/(space+2));
}
int main()
{
	long long n,i;
	bool ok=0;
	citire();
	n=strlen(text+1)-1;
	for(i=1;i<=n;i++)
		if(litera(i))
		{
			letter++;
			ok=1;
		}
		else
			if((text[i]==' ')&&ok)
			{
				space++;
				ok=0;
			}
	afisare();
	return 0;
}