def main():
    import itertools
    digits = ['1','2','3','4','5','6','7','8','9']
    operators = ['+', '-', '']

    for combination in itertools.product(operators, repeat=8): # combinations of 8 operators
        # Create all possible combinations of digits and operators as lists
        statement = [None] * (len(digits) + len(combination))
        statement[::2] = digits
        statement[1::2] = combination

        if eval(''.join(statement)) == 100:  # concatenate the elements
            print(''.join(statement))


if __name__ == '__main__':
    main()