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# Parsing string with base into a number is easy
num = int(str, radix)
# We have to write our own function for outputting to string with arbitrary base
def itoa(num, radix):
 result = "" 
 while num > 0:
 result = "01234567abcdefghijklmnopqrstuvwxyz"[num % radix] + result
 num /= radix
 return result