set


#include <iostream>

#include<set>

using namespace std;

int main(int argc,char*argv[])

{set<char>s,v;

//string a;

char a;int i=4;

while(i--)

{

cin>>a;

s.insert(a);

}

set<char>::iterator it;

for(it=s.begin();it!=s.end();it++)

{if(*it%2==0)

cout<<*it<<" ";

}

return 0;

}