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Dec 10th, 2016
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  1. def add_dash(n, acc=0, s=""):
  2. if n==0 and s=="":
  3. return "0"
  4. if n==0:
  5. result=""
  6. for i in range(len(s)-1, -1,-1):
  7. result+=s[i]
  8. return result
  9. if n%10%2==0 and acc==1:
  10. s=s+"_"+str(n%10)
  11. else:
  12. s=s+str(n%10)
  13. if n%10%2==0:
  14. acc=1
  15. else:
  16. acc=0
  17. return add_dash(n/10, acc, s)
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