import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) {
		BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
		String[] player = new String[2];
		try {

			if(buff.readLine().equals("oda")){
				player[0] = "oda";
				player[1] = "yukiko";
			}else{
				player[0] = "yukiko";
				player[1] = "oda";
			}

			int count = 0;
			for(int i = 0; i < 8; ++i){
				String line = buff.readLine();
				for(int j = 0; j < 8; ++j){
					if(line.charAt(j) == 'w' || line.charAt(j) == 'b'){
						count++;
					}
				}
			}

			System.out.println(player[count%2]);

		} catch (NumberFormatException e) {
			e.getStackTrace();
		} catch (IOException e) {
			e.getStackTrace();
		} catch (Exception e) {
			e.getStackTrace();
		}
	}
}