#include <bits/stdc++.h>
using namespace std;
int main(){
	string c;
	int a=1,b=0,ans;
	cin>>c;
	for(int i=0;;i++){
		b++;
		if((c[i]-'a'>=0&&c[i]-'a'<=25)||(c[i]-'A'>=0&&c[i]-'A'<=25)||(c[i]-'0'<=9&&c[i]-'0'>=0)||c[i]=='!'||c[i]=='#'||c[i]=='$'||c[i]=='@') ans=1;
		else if(c[i]==','){
			if(i>=6&&i<=12&&a==1){
				for(int j=0;j<b-1;j++) cout<<c[j];
				cout<<endl;
				b=0;
			}
		}
		else a=0;
	}
    return 0;
}