#include <iostream>
#include <cmath>
#include <string>
#include <vector>
using namespace std;
int main(){

    string rec;

    vector <string> dobre;
    while (cin>>rec){
        bool tacno=true;

        if(rec[0]!='0' || !(rec[1]=='X'||rec[1]=='x')){
            continue;
        }

        for(int i=2;i<rec.length();i++){
            if(!((rec[i]>='0'&& rec[i]<='9')||(rec[i]>='a'&&rec[i]<='f')||(rec[i]>='A'&&rec[i]<='F')))
            {
                tacno=false;
                break;

            }


        }
        if(tacno==true){
            dobre.push_back(rec);
        }


    }
    for(string valja : dobre){
        cout<<valja<<" ";
    }
    return 0;

}