senin=input()
ls=[]
cnt=0
for i in range(8):
    ls=list(input())
    cnt+=ls.count("w")
    cnt+=ls.count("b")

if senin=="oda" and cnt%2==0:
    print("oda")
elif senin=="oda" and cnt%2==1:
    print("yukiko")
elif senin=="yukiko" and cnt%2==0:
    print("yukiko")
elif senin=="yukiko" and cnt%2==1:
    print("yukiko")