Hello There. I have completed the code and getting the correct output. But still the test is failed i checked the formatting and seems like everything is ok to me. Please Help me if possible. My code is given below.

```
def arithmetic_arranger(problems, show_answers=True):
first=""
second=""
lines=""
res=""
if len(problems)>5:
return "Error: Too many problems."
else:
for problem in problems:
print(problem)
upper,operator,lower=problem.split()
print(upper,operator,lower)
if not upper.isdigit() or not lower.isdigit():
return "Error: Numbers must only contain digits."
else:
if len(upper) > 4 or len(lower) > 4:
return "Error: Numbers cannot be more than four digits."
if operator != "+" and operator != "-":
return "Error: Operator must be '+' or '-'."
elif operator == "+" :
sol = str(int(upper) + int(lower))
elif operator == "-" :
sol = str(int(upper) - int(lower))
length = max(len(upper), len(lower)) + 2
top=str(upper).rjust(length)
bottom=operator+str(lower).rjust(length-1)
line = ""
result = str(sol.rjust(length))
for _ in range(length):
line += "-"
if problem!=problems[-1]:
first +=top+' '
second +=bottom+' '
lines +=line+' '
res +=result+' '
else:
first +=top
second +=bottom
lines +=line
res +=result
if (show_answers):
operations= first+"\n"+second+"\n"+lines+"\n"+res
else:
operations= first+"\n"+second+"\n"+lines
return operations
print(f'\n{arithmetic_arranger(["3 + 855", "988 + 40"])}')
```