var bar = @('▁'..'█');
loop {
    print 'Numbers, please, separated by space/commas: ';
    var numbers = read(String).trim.split(/[\s,]+/).map{.to_n};
    var (min, max) = numbers.minmax;
    say "min: %5f; max: %5f"%(min, max);
    var div = ((max - min) / bar.end);
    say (min == max ? bar.last*numbers.len : numbers.map{|num| bar[(num - min) / div]}.join);
}