string s;
cin>>s;
int p=s.find(',');
s=s+",";
bool f=1;
while(p!=-1)
{
string s1=s.substr(0,p);
if(!(s1.size()<6||s1.size()>12))
{
for(int i=0;i<s1.size();i++)
{
if((!(isalpha(s[i])||isdigit(s[i])))&&s[i]!='!'&&s[i]!='@'&&s[i]!='#'&&s[i]!='$')
{
f=0;
break;
}
}
}else{
f=0;
}
if(f)
{
cout<<s1<<'\n';
}
s.erase(0,p+1);
p=s.find(',');
}
return 0;
}
