#include<fstream.h>
#include<string.h>
ifstream fin("text.in");
ofstream fout("text.out");

char c;
unsigned long sum,cont,ok;
int main()
{
	while(fin>>c)
	{
		if(c>='a' && c<='z' || c>='A' && c<='Z')
		{
			sum++;
			ok=1;
		}
		else
		{
			if(ok==1) 
				cont++;
			ok=0;
		}

	}
	if(sum==0 ||cont==0)
		fout<<"0\n";
	else
	fout<<sum/cont<<'\n';
	fout.close();
	return 0;
}