dag 3b werkt niet

bestand = open('input.txt', 'r')
alles = bestand.readlines()
for x in range(len(alles)):
  alles[x] = alles[x].replace('\n', '')

punten = '0abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
dedingen = []
antwoord = 0

for x in range(len(alles)):
  linkerhelft = ''
  rechterhelft = ''
  for y in range(int(len(alles[x])/2)):
    linkerhelft += alles[x][y]
    rechterhelft += alles[x][y+int(len(alles[x])/2)]
#  print('links:', linkerhelft)
#  print('rechts:', rechterhelft)
  for z in range(len(linkerhelft)):
    if rechterhelft.find(linkerhelft[z]) != -1:
      gevonden = linkerhelft[z]
  #print(gevonden)
  dedingen.append(gevonden)

for x in range(len(dedingen)):
  antwoord += punten.find(dedingen[x])
#  print(dedingen[x], punten.find(dedingen[x]))

print(antwoord)

badges = []
antwoord2 = 0

for x in range(int(len(alles)/3)):
  for y in range(len(alles[x*3])):
    elf2 = alles[x*3+1].find(alles[x*3][y])
    elf3 = alles[x*3+2].find(alles[x*3][y])
    if elf2 > 0 and elf3 > 0:
      gevonden = alles[x*3][y]
  badges.append(gevonden)

for x in range(len(badges)):
  antwoord2 += punten.find(badges[x])

#  print(badges[x], 'is', punten.find(badges[x]))
#  print('antwoord is nu', antwoord2)


#print(len(badges))
#print(badges)

print(antwoord2)