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