inp = [

# [45,35,16,30,36],

# [32,32,40,31,43],

# [ 5,11,34,25, 1],

# [ 7, 2, 8,25,39],

# [26,18,19, 5,32],

# [ 5,31, 1,29,40],

# [ 1,29,14,31,46],

# [41,47,12,45,34],

# [35, 2,25, 1,26],

# [13,11, 4,36,14],

# [49,26,16,46,42],

# [46,15, 3,46,29],

# [ 6,17,18,41,20],

# [39,38,14,29,41],

# [ 1, 1,50,13, 8]

]

if not inp:

print("Open the file, and paste the matrix(or uncomment to use the example)")

exit()

output = []

layer = 0

def right():

global inp, layer, output

for i in range(layer, len(inp[0]) - layer):

if len(output) < len(inp)*len(inp[0]):

output.append(inp[layer][i])

def down():

global inp, layer, output

for i in range(1+layer, len(inp) - layer):

if len(output) < len(inp)*len(inp[0]):

output.append(inp[i][-1-layer])

def left():

global inp, layer, output

for i in range(len(inp[0])-2-layer, layer-1, -1):

if len(output) < len(inp)*len(inp[0]):

output.append(inp[-1-layer][i])

def up():

global inp, layer, output

for i in range(len(inp)-2-layer, layer, -1):

if len(output) < len(inp)*len(inp[0]):

output.append(inp[i][layer])

layer += 1

while len(output) < len(inp)*len(inp[0]):

right()

down()

left()

up()

print(output)