human
Smallest alphabet greater than a given character | Returns the smallest character from the given set of letters that is greater than K.
Take the first element as l and the rightmost element as r.
if this while condition does not satisfy simply return the first element ..
Return the smallest element.
Driver Code.
Function call"
How can the above be solved in Python?

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Write me a code to smallest alphabet greater than a given character and the other steps required?
assistant
#Here is code to smallest alphabet greater than a given character and the other steps required.
 def nextGreatestAlphabet ( alphabets , K ) :
	n = len ( alphabets )
	if ( K >= alphabets [ n - 1 ] ) :
	return alphabets [ 0 ]
	l = 0
	r = len ( alphabets ) - 1
	ans = - 1
	while ( l <= r ) :
		mid = int ( ( l + r ) / 2 )
		if ( alphabets [ mid ] > K ) :
			r = mid - 1
			ans = mid
		else :
			l = mid + 1
	if ( alphabets [ ans ] < K ) :
		return alphabets [ 0 ]
	else :
		return alphabets [ ans ]
letters = [ ' A ' , ' r ' , ' z ' ]
K = ' z '
result = nextGreatestAlphabet ( letters , K )
print ( result )