import sys sys.setrecursionlimit(10 ** 6) int1 = lambda x: int(x) - 1 p2D = lambda x: print(*x, sep="\n") def MI(): return map(int, sys.stdin.readline().split()) def LI(): return list(map(int, sys.stdin.readline().split())) def LLI(rows_number): return [LI() for _ in range(rows_number)] def main(): oda=input()=="oda" cnt=sum(input().count(".") for _ in range(8)) players=["yukiko","oda"] if cnt%2:print(players[oda]) else:print(players[oda]) main()