import pandas as pd


def add_column_length(table_name, table_data):
    columns = {'b': 'bra_id', 'c': 'course_sc_id'}
    for index, column in columns.items():
        if index in table_name:
            table_data[
                column + "_len"] = pd.Series(
                    map(lambda x: len(str(x)), table_data.index.get_level_values(column)), index=table_data.index)

    return table_data
