text: #Kunal Gautam
  #Codewars : @Kunalpod
  #Problem name: Not very secure
  #Problem level: 5 kyu
  
  import re
  def alphanumeric(string):    
      return bool(re.findall('[a-zA-Z0-9]+', string)) and re.findall('[a-zA-Z0-9]+', string)[0] == string
  