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def next_stepping_number(N):
    N = str(N)
    for i in range(len(N) - 1):
        if abs(int(N[i]) - int(N[i+1])) != 1:
            return int(N[:i+1] + str(int(N[i]) + 1 if int(N[i]) < int(N[i+1]) else int(N[i]) - 1) + '9'*(len(N)-i-1))
    return int(N) + 1

print(next_stepping_number(4))

python3✅

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def getLargestString(s, k):
    frequency_array = [0] * 26

    for i in range(len(s)):

        frequency_array[ord(s[i]) -
                        ord('a')] += 1
    ans = ""
    i = 25
    while i >= 0:
        if (frequency_array[i] > k):
            temp = k
            st = chr( i + ord('a'))
            
            while (temp > 0):
                ans += st
                temp -= 1
          
            frequency_array[i] -= k
            j = i - 1
            
            while (frequency_array[j] <= 0 and
                   j >= 0):
                j -= 1
            if (frequency_array[j] > 0 and
                j >= 0):
                str1 = chr(j + ord( 'a'))
                ans += str1
                frequency_array[j] -= 1
            
            else:
                break
        elif (frequency_array[i] > 0):
            temp = frequency_array[i]
            frequency_array[i] -= temp
            st = chr(i + ord('a'))
            while (temp > 0):
                ans += st
                temp -= 1
        else:
            i -= 1
            
    return ans          

if name == "main":
  
    S = input()
    k = 3
    print (getLargestString(S, k))


Python
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