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- def add_dash(n, acc=0, s=""):
- if n==0 and s=="":
- return "0"
- if n==0:
- result=""
- for i in range(len(s)-1, -1,-1):
- result+=s[i]
- return result
- if n%10%2==0 and acc==1:
- s=s+"_"+str(n%10)
- else:
- s=s+str(n%10)
- if n%10%2==0:
- acc=1
- else:
- acc=0
- return add_dash(n/10, acc, s)
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