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

int main() {
  char first[7], second[7];
  scanf("%s", first);

  if (first[0]=='o') {
    strcpy(second, "yukiko");    
  } else {
    strcpy(second, "oda");
  }

  int i, j, b=0, w=0;
  for (i=0; i<8; i++) {
    scanf("%*c");
    for (j=0; j<8; j++) {
      char c;
      scanf("%c", &c);

      if (c=='b') b++;
      else if (c=='w') w++;
    }
  }

  printf("%s\n", (b-w)%2==0 ? first: second);
  return 0;
}