#reversi
f=input()
B=[i for i in input()]
if f=="yukiko":
    fn=0
else:
    fn=1
nu=0
for i in range(8):
    if B[i]=="B" or B[i]== "W":
        nu+=1
nu+=fn
nu%=2
if nu==0:
    print("Yukiko")
else:
    print("Oda")