I am stuck on the Arithmetic Formatter project. I have written the following code but cannot understand the source of failure.

CODE:

```
def arithmetic_arranger(problems, showAns = False):
if len(problems)>5:
return "Error: Too many problems."
else:
arranged_problems = []
for i in problems:
x = i.split()
n1 = x[0]
n2 = x[2]
operand = x[1]
if operand not in ["+", "-"]:
return "Error: Operator must be '+' or '-'."
else:
for digit in n1:
if digit not in ["0","1","2","3","4","5","6","7","8","9"]:
return "Error: Numbers must only contain digits."
else:
continue
for digit in n2:
if digit not in ["0","1","2","3","4","5","6","7","8","9"]:
return "Error: Numbers must only contain digits."
else:
continue
if len(n1)>4 or len(n2)>4:
return "Error: Numbers cannot be more than four digits."
else:
if operand == '+':
answer = int(n1) + int(n2)
else:
answer = int(n1) - int(n2)
width = max(len(n1),len(n2)) +2
topLine = str(n1.rjust(width))
secondLine = str(operand + " " + n2)
dashLine = str("-" * width)
answerLine = str(answer).rjust(width)
if showAns == True:
arranged_problems.append(topLine + "\n" + secondLine + "\n" + dashLine + "\n" + answerLine)
else:
arranged_problems.append(topLine + "\n" + secondLine + "\n" + dashLine)
return arranged_problems
```

Error Msg:

```
[' 32\n+ 698\n-----', ' 3801\n- 2\n------', ' 45\n+ 43\n----', ' 123\n+ 49\n-----']
F..F..
======================================================================
FAIL: test_arrangement (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/fcc-arithmetic-arranger/test_module.py", line 10, in test_arrangement
self.assertEqual(actual, expected, 'Expected different output when calling "arithmetic_arranger()" with ["3 + 855", "3801 - 2", "45 + 43", "123 + 49"]')
AssertionError: [' 3\n+ 855\n-----', ' 3801\n- 2\n---[42 chars]---'] != ' 3 3801 45 123\n+ 855 [56 chars]----' : Expected different output when calling "arithmetic_arranger()" with ["3 + 855", "3801 - 2", "45 + 43", "123 + 49"]
======================================================================
FAIL: test_solutions (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/fcc-arithmetic-arranger/test_module.py", line 39, in test_solutions
self.assertEqual(actual, expected, 'Expected solutions to be correctly displayed in output when calling "arithmetic_arranger()" with arithemetic problems and a second argument of `True`.')
AssertionError: [' 32\n- 698\n-----\n -666', ' 1\n-[73 chars]172'] != ' 32 1 45 123\n- 698 [90 chars] 172' : Expected solutions to be correctly displayed in output when calling "arithmetic_arranger()" with arithemetic problems and a second argument of `True`.
----------------------------------------------------------------------
Ran 6 tests in 0.001s
FAILED (failures=2)
```

Thanks!