STDOUT.sync = true
num = "0000000000"
(0...10).each{|place|
    hits = []
    (0...10).each{|i|
        num[place] = i.to_s
        puts num
        hit = gets.to_i
        exit 0 if hit === 10
        hits.push([hit, i])
    }
    num[place] = hits.max[1].to_s
}