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