S = input()
B = input()
B1 = input()
B2 = input()
B3 = input()
B4 = input()
B5 = input()
B6 = input()
B7 = input()

list = []
list.extend(B)  
list.extend(B1)
list.extend(B2)
list.extend(B3)
list.extend(B4)
list.extend(B5)
list.extend(B6)
list.extend(B7)

w_num = list.count("w")
b_num = list.count("b")
total_num = w_num + b_num
if S == "oda":
    if total_num % 2 == 0:
        print("oda")
    else:
        print("yukiko")
else:
    if total_num % 2 == 0:
        print("yukiko")
    else:
        print("oda")