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def get_lines(filename)
return File.open(filename, 'r').readlines
end
def get_format(lines)
return "%0#{lines.size.to_s.size}d"
end
def get_output(lines)
format = get_format(lines)
output = ''
lines.each_with_index do |line,i|
output += "#{sprintf(format, i+1)}: #{line}"
end
return output
end
print get_output(get_lines(ARGV[0]))
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