let black = readLine()!
let white = black.prefix(1) == "o" ? "yukiko" : "oda"

var bCount = 0
var wCount = 0
for i in 1...8 {
    let line = readLine()!
    bCount += line.reduce(0, {$0 + ($1 == "b" ? 1 : 0)})
    wCount += line.reduce(0, {$0 + ($1 == "w" ? 1 : 0)})
}

if bCount > wCount {
    print(white)
} else {
    print(black)
}