#include <string.h>
#include <fstream>
#define LgTx 1001 
std::ifstream in("text.in");
std::ofstream out("text.out");
int main ()
{
	char a[LgTx];
	int lg,lgap,lgt=0,cuv=0,i;
	while(in>>a)
	{
	lgap=strlen(a);
	if(lgap>1)
	{
		cuv++;
		lg=0;
		for(i=0;i<lgap;i++)
	{
		if(a[i]=='-')
			cuv++;
		else
			lg++;
	}
		lgt+=lg;
	}
	}
	out<<lgt/cuv;
	out.close();
}