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lst=[[[1,2,3]],[[4,5,6]]]
def are_addable(lst):
	if(len(lst[0])==len(lst[1]) and len(lst[0][0])==len(lst[1][0]) and is_wellformed(lst[0])=='True' and is_wellformed(lst[1])=='True'):
		return("True")
	else:
		return("False")	
def add_lists(lst):
	l=[0 for i in range(len(lst[0]))]
	for i in range(len(lst[0])):
		l[i]=lst[0][i]+lst[1][i]
	return(l)
def add_matrices(lst):
	m=[ [ 0 for i in range(len(lst[0][0])) ] for j in range(len(lst[0])) ]
	if(are_addable(lst)=='True'):
		for i in range(len(lst[0])):
				m[i]=add_lists(lst[0][i],lst[1][i])
	    return(m)
	else:
		return("Invalid input")
print(add_matrices(lst))

Traceback (most recent call last):
  File "/usr/lib/python3.7/py_compile.py", line 143, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 791, in source_to_code
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "./prog.py", line 17
    return(m)
            ^
IndentationError: unindent does not match any outer indentation level

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.7/py_compile.py", line 147, in compile
    raise py_exc
py_compile.PyCompileError: Sorry: IndentationError: unindent does not match any outer indentation level (prog.py, line 17)

Standard output is empty