using python without external libaries

Using integer arithmetic operators '+' and '-',

print all combinations that sum up to 'sum' by inserting the operators between digits in 'number'.

example for 'number=123456789' and 'sum = 0'

Print the output using the terminal:

Output should be exactly like this from 1 - 22

1 : +1+2-34-56+78+9=0

2 : +1-2-34+5+6+7+8+9=0

3 : +1-23-4-56-7+89=0

...

12 : -1+2+34-5-6-7-8-9=0

13 : -1+23+4+56+7-89=0

14 : -1-2+34+56-78-9=0

...

22 : -12-34+56+7-8-9=0