a = int(input('Enter a: '))
b = int(input('Enter b: '))

matrix = [
	[a, a+1],
	[b, b+1]
]

first = True
for line in matrix:
	#for el in line:
	if first == True:
		f_str = f'{line[0]} {line[1]}\n'
		first = False
	else:
		s_str = f'{line[0]} {line[1]}\n'
# Write lines
with open('file', 'w') as f:
	f.write(f_str)
	f.write(s_str)
	f.close()

readed_matrix = []
with open('file', 'r') as f:
	for x in f:
		if x == '' or x == '\n':
			continue
		x = x.replace('\n', '')
		vals = x.split(' ')
		readed_matrix.append(vals)
	f.close()

print(f'''
Original matrix:
{matrix}
Readed matrix:
{matrix}
''')