answer = []
(0..9).to_a.combination(4){|_v|
    _v.permutation{|v|
        answer << v
    }
}

def simulate(answer,query)
    x=y=0
    4.times{|i|
        if answer[i] == query[i]
            x+=1
        elsif answer.include?(query[i])
            y+=1
        end
    }
    return [x,y]
end

while answer.size > 1
    v = answer.sample
    puts v*" " ; STDOUT.flush
    res = gets.split.map(&:to_i)
    answer.delete_if{|e| simulate(e,v) != res}
end