import java.util.*;
import static java.lang.Math.*;

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;
	  String B[]=new String[8];
	  for(int i=0;i<8;i++){
		  B[i]=sc.next();
	  }
	  char b[][]=new char[8][8];
	  for(int i=0;i<8;i++){
		  char S[]=B[i].toCharArray();
		  for(int j=0;j<8;j++){
			  b[i][j]=S[j];
		  }
	  }
	  int k=0;
	  int bl=0;
	  int w=0;
	  for(int i=0;i<8;i++){
		  for(int j=0;j<8;j++){
			  if(b[i][j]=='.')k++;
			  if(b[i][j]=='w')w++;
			  if(b[i][j]=='b')bl++;
		  }
	  }
	  if(x==0 && k%2==0)System.out.println("yukiko");
	  if(x==0 && k%2==1)System.out.println("oda");
	  if (x==1 && k%2==0)System.out.println("oda");
	  if(x==1 && k%2==1)System.out.println("yukiko");
  }
}