#include <bits/stdc++.h>
using namespace std;string s,a[1005];long long q,k;bool flag;int main(){q=1;k=1;cin>>s;s+=',';for(int i=0;i<s.size();i++){if(s[i]!=','){a[q]+=s[i];}else{q++;k++;}}for(int i=1;i<=k;i++){flag=true;for(int j=0;j<a[i].size();j++){if( (a[i][j]>='a' && a[i][j]<='z') || (a[i][j]>='A' &&a[i][j]<='Z') || (a[i][j]>='0' && a[i][j]<='9') || (a[i][j]=='!' || a[i][j]=='@' || a[i][j]=='#' || a[i][j]=='$') && (a[i].size()<=12)){continue;}else{flag=false;}}if(flag==true){cout<<a[i]<<endl;}}return 0;}