public class d {
    public static void main(String[] args) throws Exception
    {
        BufferedReader reader= new BufferedReader(new InputStreamReader(System.in));
        ArrayList<String> s = new ArrayList<String>();
        s.add(0,reader.readLine());
        String max=null;
        for(int i=1;i<=4;i++)
{
            s.add(i,reader.readLine());
            if (s.get(i-1).length() >s.get(i).length()){
                s.set(0, s.get(i));


           }

            }


        System.out.print(s.get(0));
       }
}