Buggy python submission (verdict: Runtime Error):
### 解答
N, K = map(int, input().split())
A = list(map(int, input().split()))

#B = [0]*N                                 # 記録用のリスト

for k in range(K):                        # 以降の操作をK回繰り返す
  B = [0 for _ in range(N)] 
  for i in range(N):                      # 各電球によって照らされる範囲を考える
    start = max(0, i-A[i])                # 始点のインデックスは0かi-A[i]
    end = min(N, i+A[i]+1)                # 終点のインデックスはNかi+A[i]+1
    B[start] += 1                         # 始点に+1を記録する
    if end <= N - 1:
      B[end] -= 1                         # 終点に電球が存在する場合は-1を記録する
  amin = B[0]
  A[0] = B[0] 
  for i in range(1, N):                   # 累積和の計算
    A[i] = B[i-1] + B[i]
    amin = min(A[i], amin)                                   # AをBで更新してつぎのループへ 
  if amin == N:                        # すべての電球がN個の電球に照らされるタイミングでbreakする
    break

print(*A)                                 # リストAの中身を順に表示

Fixed submission:
N = int(input())
a = 26
counter = 1
while a<N:
  N -= a
  counter += 1
  a *= 26
ans = []
N -= 1
while N>=26:
  ans.append(N%26)
  N = N //26
ans.append(N)
dic = ["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"]
ans = [dic[i] for i in ans[::-1]]
n = len(ans)
print("a"*(counter-n) + "".join(ans))

Buggy python submission (verdict: Runtime Error):
N = int(input())
a = 26
counter = 1
while a<N:
  N -= a
  counter += 1
  a *= 26
ans = []
N -= 1
while N>26:
  ans.append(N%26)
  N = N //26
ans.append(N)
#print(ans)
dic = ["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"]
ans = [dic[i] for i in ans[::-1]]
n = len(ans)
print("a"*(counter-n) + "".join(ans))

Fixed submission:
N = int(input())
a = 26
counter = 1
while a<N:
  N -= a
  counter += 1
  a *= 26
ans = []
N -= 1
while N>=26:
  ans.append(N%26)
  N = N //26
ans.append(N)
dic = ["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"]
ans = [dic[i] for i in ans[::-1]]
n = len(ans)
print("a"*(counter-n) + "".join(ans))

Buggy python submission (verdict: Runtime Error):
N = int(input())
a = 26
counter = 1
while a<N:
  N -= a
  counter += 1
  a *= 26
ans = []
N -= 1
while N>26:
  ans.append(N%26)
  N = N //26
ans.append(N)
#print(ans)
dic = ["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"]
ans = [dic[i] for i in ans[::-1]]
n = len(ans)
print("a"*(counter-n) + "".join(ans))

Fixed submission:
N = int(input())
a = 26
counter = 1
while a<N:
  N -= a
  counter += 1
  a *= 26
ans = []
N -= 1
while N>=26:
  ans.append(N%26)
  N = N //26
ans.append(N)
dic = ["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"]
ans = [dic[i] for i in ans[::-1]]
n = len(ans)
print("a"*(counter-n) + "".join(ans))

Buggy python submission (verdict: Runtime Error):
N = int(input())
a = 26
counter = 1
while a<N:
  N -= a
  counter += 1
  a *= 26
ans = []
N=-1
while N>26
  ans.append(N%26)
  N = N //26
ans.append(N)
dic = ["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"]
ans = [dic[i] for i in ans[::-1]]
n = len(ans)
print("a"*(conter-n) + "".join(ans))

Fixed submission:
N = int(input())
a = 26
counter = 1
while a<N:
  N -= a
  counter += 1
  a *= 26
ans = []
N -= 1
while N>=26:
  ans.append(N%26)
  N = N //26
ans.append(N)
dic = ["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"]
ans = [dic[i] for i in ans[::-1]]
n = len(ans)
print("a"*(counter-n) + "".join(ans))