import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String first = sc.next();
		String second = first.equals("oda")?"yukiko":"oda";
		
		//石の数が偶数なら先攻、奇数なら後攻を出力
		int num = 0;
		for (int i=0; i<8; i++) {
			String line = sc.next();
			for (int j=0; j<8; j++) {
				if (line.charAt(j)=='w' || line.charAt(j)=='b') {num++;}
			}
		}
		
		System.out.println(num%2==0?first:second);
	}
}