#include <bits/stdc++.h>
using namespace std;
int p=0,o=0,x,y;
int main() {
	string s;
	cin >> s;
	s[s.size()]=',';
	for(int i=0;i<s.size();i++){
		int y=i-1;
		if(s[i]==','){
			bool f=true;
			int cnt=0;
			for(int j=x;j<=y;j++){
				if((s[j]>='a'&&s[j]<='z')||(s[j]>='A'&&s[j]<='Z')||(s[j]>='0'&&s[j]<='9')||(s[j]=='!'||s[j]=='@'||s[j]=='#'||s[j]=='$')){
					cnt++;
					f=true;
				}else{
					f=false;
				}
				
			}
			if(f){
				for(int j=x;j<=y;j++){
					cout<<s[i];
				}
				cout<<endl;
			}//移动到一道新左边 
			x++;
			x++;
			x+=y;
		}
	}
    return 0;
}