#include <bits/stdc++.h>
using namespace std;
long long t,sz,zm,d,x,ts,sum;
string s; 
int main(){
	cin>>s;
	for(int i=0;i<s.size();i++)
	{
		if(s[i]==',')
		{
			sum++;
			if(t>=6&&t<=12&&x+d+sz>=2&&zm==1)
			{
				if(sum>=2) cout<<endl;
				for(int j=i-t;s[j]!=',';j++) cout<<s[j];
			}
			zm=0;
			d=0;
			x=0;
			t=0;
			sz=0;
			continue;
		}
		if(s[i]=='@'||s[i]=='!'||s[i]=='#'||s[i]=='$') zm=1;
		if(s[i]>='a'&&s[i]<='z') x=1;
		if(s[i]>='A'&&s[i]<='Z') d=1;
		if(s[i]>='0'&&s[i]<='9') sz=1;
		t++;
	}
	return 0;
}