import java.util.Scanner;

class Yuki88 {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int x = 0;
    for(int i=0; i<8; ++i){
      String b = sc.next();
      for(int j=0; j<8; ++j){
        char a = b.charAt(j);
        if(a=='w' || a=='b'){
          x+=1;
        }
      }
    }
    if(x%2==0){
      System.out.println(s);
    } else {
      if(s.equals("oda")){
        System.out.println("yukiko");
      } else {
        System.out.println("oda");
      }
    }
  }
}