def bin_extend_in_U2(binint, amount):
    """
    Extends number in U2

    :param binint: Number to extend in U2
    :type binint: string

    :param amount: number of characters to be added
    :type amount: int

    :return: Number in U2
    :rtype: string
    """
    for _ in range(amount):
        binint = binint[0] + binint

    return binint