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[1-oda])
    else:print(players[oda])
main()