-- yukicoder My Practice
-- author: Leonardone @ NEETSDKASU

s = io.read()

t = 0

for ln in io.lines() do
	for c in ln:gmatch('[bw]') do
		t = t + 1
	end
end

if t % 2 == 0 then
	print(s)
elseif s == 'oda' then
	print('yukiko')
else
	print('oda')
end