1 4 9
16 25 36
49 64 81

n=[]
dane = open("num.txt", "r")

for i in dane:
  i = i.replace('n','')
  for j in i.split(' '):
        j = int(j)
        j = j**2
        n.append(j)

nowy = open("newnum.txt","w")
nowy.write(str(n))
nowy.close()