Buggy python submission (verdict: Runtime Error):
def A(x):
  if ord(x) - ord('a') >= 0:
    print('a')
  else:
    print('A')


def B(n, k, p_list):
  p_list = sorted(p_list)
  print(sum(p_list[:k]))


def C(N):
  for i in range(99):
    if N < 26**i:
      ans = []
      for j in range(i):
        ans += chr(ord('a') + N % 26)
        N /= 26
      return ''.join(ans)
    else:
      N -= 26**i


def main():
  # letter = input()
  # A(letter)
  # for x in ['A', 'Z', 'a', 'z']:
  #   A(x)

  # n, k = map(int, input().split())
  # p_list = map(int, input().split())
  # B(n, k, p_list)
  print(C(int(input())))
  # C(702)
  # C(703)
  # C(18279)
  # C(475254)


if __name__ == '__main__':
  main()


Fixed submission:
def A(x):
  if ord(x) - ord('a') >= 0:
    print('a')
  else:
    print('A')


def B(n, k, p_list):
  p_list = sorted(p_list)
  print(sum(p_list[:k]))


def C(N):
  for i in range(99):
    if N < 26**i:
      ans = []
      for j in range(i):
        ans += chr(ord('a') + N % 26)
        N //= 26
      return ''.join(ans[::-1])
    else:
      N -= 26**i


def main():
  # letter = input()
  # A(letter)
  # for x in ['A', 'Z', 'a', 'z']:
  #   A(x)

  # n, k = map(int, input().split())
  # p_list = map(int, input().split())
  # B(n, k, p_list)
  print(C(int(input())))
  #for i in range(1, 27):
  #  print(C(26 + i))
  # C(703)
  # C(18279)
  # C(475254)


if __name__ == '__main__':
  main()

Buggy python submission (verdict: Runtime Error):
def A(x):
  if ord(x) - ord('a') >= 0:
    print('a')
  else:
    print('A')


def B(n, k, p_list):
  p_list = sorted(p_list)
  print(sum(p_list[:k]))


def _get_base_x(n, x):
  a = [
      'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
      'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
  ]
  b = []
  while True:
    s = n // x
    y = n % x
    b = b + [y]
    if s == 0:
      break
    n = s
  b.reverse()
  ret = []
  for i in b:
    ret.append(a[i - 1])
  print(''.join(ret))


def C(x):
  _get_base_x(x, 26)


def main():
  # letter = input()
  # A(letter)
  # for x in ['A', 'Z', 'a', 'z']:
  #   A(x)

  # n, k = map(int, input().split())
  # p_list = map(int, input().split())
  # B(n, k, p_list)
  C(long(input()))
  # num = 1
  # for i in range(50):
  #   print(str(num))
  #   # C(int(str(num)))
  #   num = num * 26 + 1


if __name__ == '__main__':
  main()


Fixed submission:
def A(x):
  if ord(x) - ord('a') >= 0:
    print('a')
  else:
    print('A')


def B(n, k, p_list):
  p_list = sorted(p_list)
  print(sum(p_list[:k]))


def C(N):
  for i in range(99):
    if N < 26**i:
      ans = []
      for j in range(i):
        ans += chr(ord('a') + N % 26)
        N //= 26
      return ''.join(ans[::-1])
    else:
      N -= 26**i


def main():
  # letter = input()
  # A(letter)
  # for x in ['A', 'Z', 'a', 'z']:
  #   A(x)

  # n, k = map(int, input().split())
  # p_list = map(int, input().split())
  # B(n, k, p_list)
  print(C(int(input())))
  #for i in range(1, 27):
  #  print(C(26 + i))
  # C(703)
  # C(18279)
  # C(475254)


if __name__ == '__main__':
  main()

Buggy python submission (verdict: Runtime Error):
def A(x):
  if ord(x) - ord('a') >= 0:
    print('a')
  else:
    print('A')


def B(n, k, p_list):
  p_list = sorted(p_list)
  print(sum(p_list[:k]))


def _get_base_x(n, x):
  a = [
      'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
      'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
  ]
  b = []
  while True:
    s = n // x
    y = n % x
    b = b + [y]
    if s == 0:
      break
    n = s
  b.reverse()
  ret = []
  for i in b:
    ret.append(a[i - 1])
  print(''.join(ret))


def C(x):
  _get_base_x(x, 26)


def main():
  # letter = input()
  # A(letter)
  # for x in ['A', 'Z', 'a', 'z']:
  #   A(x)

  # n, k = map(int, input().split())
  # p_list = map(int, input().split())
  # B(n, k, p_list)
  C(bignum(input()))
  # C(475255)


if __name__ == '__main__':
  main()


Fixed submission:
def A(x):
  if ord(x) - ord('a') >= 0:
    print('a')
  else:
    print('A')


def B(n, k, p_list):
  p_list = sorted(p_list)
  print(sum(p_list[:k]))


def C(N):
  for i in range(99):
    if N < 26**i:
      ans = []
      for j in range(i):
        ans += chr(ord('a') + N % 26)
        N //= 26
      return ''.join(ans[::-1])
    else:
      N -= 26**i


def main():
  # letter = input()
  # A(letter)
  # for x in ['A', 'Z', 'a', 'z']:
  #   A(x)

  # n, k = map(int, input().split())
  # p_list = map(int, input().split())
  # B(n, k, p_list)
  print(C(int(input())))
  #for i in range(1, 27):
  #  print(C(26 + i))
  # C(703)
  # C(18279)
  # C(475254)


if __name__ == '__main__':
  main()

Buggy python submission (verdict: Runtime Error):
def A(x):
  if ord(x) - ord('a') >= 0:
    print('a')
  else:
    print('A')


def B(n, k, p_list):
  p_list = sorted(p_list)
  print(sum(p_list[:k]))


def _get_base_x(n, x):
  a = [
      'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
      'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
  ]
  b = []
  while True:
    s = n // x
    y = n % x
    b = b + [y]
    if s == 0:
      break
    n = s
  b.reverse()
  ret = []
  for i in b:
    ret.append(a[i - 1])
  print(''.join(ret))


def C(x):
  _get_base_x(x, 26)


def main():
  # letter = input()
  # A(letter)
  # for x in ['A', 'Z', 'a', 'z']:
  #   A(x)

  # n, k = map(int, input().split())
  # p_list = map(int, input().split())
  # B(n, k, p_list)
  C(input())


if __name__ == '__main__':
  main()


Fixed submission:
def A(x):
  if ord(x) - ord('a') >= 0:
    print('a')
  else:
    print('A')


def B(n, k, p_list):
  p_list = sorted(p_list)
  print(sum(p_list[:k]))


def C(N):
  for i in range(99):
    if N < 26**i:
      ans = []
      for j in range(i):
        ans += chr(ord('a') + N % 26)
        N //= 26
      return ''.join(ans[::-1])
    else:
      N -= 26**i


def main():
  # letter = input()
  # A(letter)
  # for x in ['A', 'Z', 'a', 'z']:
  #   A(x)

  # n, k = map(int, input().split())
  # p_list = map(int, input().split())
  # B(n, k, p_list)
  print(C(int(input())))
  #for i in range(1, 27):
  #  print(C(26 + i))
  # C(703)
  # C(18279)
  # C(475254)


if __name__ == '__main__':
  main()