#include<fstream>
#include<string.h>
#include<iostream>
using namespace std;
int main()
{char a[100]; int nr=1,i,m,n;
ifstream f("text.in");
ofstream g("text.out");
do
{
f.get(a,100); m=strlen(a); n=m;
for(i=1;i<n-1;i++)
{
	if(a[i-1]!='-' && a[i]==' ' && a[i+1]!=' ')nr++;
	else
		if(a[i]=='-' && a[i+1]!=' ' && a[i-1]!=' ')nr++;
	if(!((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z')))m--;
}
f.get();
}while(!f.eof());
g<<m/nr;
	return 0;
}