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#include <iostream>
#include <fstream>
#include <string>
#include <stdio.h>
#include <ctype.h>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int cont,s,i;
string linie;
int main()
{
s=0;
cont=0;
while(in>>linie)
{
if(linie[0]!='-')
{
for(i=0;i<linie.size();i++)
{
if(linie[i]=='-')
cont++;
if(isalpha(linie[i])) s++;
}
cont++;
}
}
out<<s/cont;
return 0;
}