#include<bits/stdc++.h>
using namespace std;
int main(){
	string a,s="",d="";
	int f=1;
	cin>>a;
	for(int i=0;i<a.size();i++){
		if(a[i]!=',') s+=a[i];
		else{
			if(s.size()>12 || s.size()<6){continue;}
			else{
				for(int j=0;j<s.size();j++){
				    if((s[j]>='0' && s[j]<='9')||(s[j]>='a' && s[j]<='z')||(s[j]>='A' && s[j]<='Z')||s[j]=='!' || s[j]=='@'||s[j]=='#' || s[j]=='$'){}
			        else{f=0;break;}
				}
				if(f==0){
					d+=s;
					d+="\n";
				}
				s="";
				f=1;
			}
		}
	}
	cout<<d;
	return 0;
}