human
Greatest number less than equal to B that can be formed from the digits of A | Function to return the greatest number not gtreater than B that can be formed with the digits of A.
To store size of A.
To store the required answer.
Traverse from leftmost digit and place a smaller digit for every position ..
Keep all digits in A.
To avoid leading zeros.
For all possible values at ith position from largest value to smallest.
Take largest possible digit.
Keep duplicate of string a.
Remove the taken digit from s2.
Sort all the remaining digits of s2.
Add s2 to current s1.
If s1 is less than B then it can be included in the answer . Note that int ( ) converts a string to integer.
change A to s2.
Return the required answer.
Driver Code"
How can the above be solved in Python?

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Give me a code to greatest number less than equal to B that can be formed from the digits of A and the other steps required?
assistant
#Here is code to greatest number less than equal to B that can be formed from the digits of A and the other steps required.
 def permuteDigits ( a : str , b : int ) -> str :
	n = len ( a )
	ans = " "
	for i in range ( n ) :
		temp = set ( list ( a ) )
		if i == 0 :
			temp . discard ( 0 )
		for j in reversed ( list ( temp ) ) :
			s1 = ans + j
			s2 = list ( a ) . copy ( )
			s2 . remove ( j )
			s2 = ' ' . join ( sorted ( list ( s2 ) ) )
			s1 += s2
			if int ( s1 ) <= b :
				ans += j
				a = ' ' . join ( list ( s2 ) )
				break
	return ans
if __name__ == " _ _ main _ _ " :
	a = "123"
	b = 222
	print ( permuteDigits ( a , b ) )