#reversi
f=input()
B = [input() for i in range(8)]
C=[]
for i in range(8):
    C.append(list (B[i]))
if f=="yukiko":
    fn=0
else:
    fn=1
nu=0
for i in range(8):
    j=0
    while j<8:
        if C[i][j]=="b" or C[i][j]== "w":
            nu+=1
        j+=1
nu+=fn
nu%=2
if nu==0:
    print("yukiko")
else:
    print("oda")