import java.util.*;

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