#include <stdio.h>
#include <string.h>

int main(void)
{
  int i, j, count = 0;
  char S[10], B[10];

  scanf("%s", S);

  for (i = 1; i <= 8; i++) {
    scanf("%s", B);

    for (j = 0; B[j] != '\0'; j++) {
      if (B[j] == 'w' || B[j] == 'b')
	count++;
    }
  }
  if (count % 2)
    printf("%s\n", strcmp(S, "oda") ? "oda" : "yukiko");
  else
    printf("%s\n", strcmp(S, "yukiko") ? "oda" : "yukiko");

  return 0;
}