def findLeastBit(num):
    def findBitHelper(num, n):
        if( 2**n > num ): return -1
        if( 2**n & num == 2**n):
            return n
        else:
            return findBitHelper(num, n+1)
    return findBitHelper(num, 0)

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Interview Question for Software Engineer I at Cisco Systems:

Find the index of the least significant bit in an interger

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