Почему на операторе elif выдает ошибку синтаксиса?

print("Matrica MxM")
i=0
j=0
Y='Y'
N='N'
while i<1:
 print("Vvedite M ot 2 do 5")
 M = int(input())
 if M >= 2 and M<=5:
  print("Hotite sami zapolnit matricu?Y/N")
  i=i+1
 else:
  print("Vvedite chislo iz zadannogo promejutka")
while j < 1:   
 Otvet =input()
 if Otvet == Y:
      j=j+1
      matrix = [[0]*M for n in range(M)]
      for x in range(M):
       for y in range(M):
        matrix[x][y] =int(input("Vvedite elementi ot 0 do 100 "))
       for im in range(M):print(matrix[im]
  elif Otvet == N:
    j=j+1
     import random
       matrix = [[random.randrange(1,100) for y in range(M)] for z in range(M)]
        for im in range(M): print(matrix[im])
 else:
  print("Vibran neverniy variant otveta, poprobuyite snova")