Find Obfuscate Message

Amazon developers are creating a new security module for Amazon Web Services. One of its functions is to obfuscate incoming messages. The obfuscation method is to select some substring of the message and right rotate that substring by 1 position one time only. The substring is selected in such a way that the resulting obfuscated message is alphabetically the smallest message that can be formed using this operation.

Here, right rotating any string by 1 position is to shift every character of string a in the right direction by 1 position and remove the last character and append it to the beginning of string a. For example, a = "ahssd", after right rotation by 1 position string a changes to "dahss".

Given the input message as a string, find the obfuscated message.

Note: A string x is alphabetically smaller than string y, if either x is a prefix of y (and x ≠ y), or there exists such i (0 ≤ i < min(|x|, |y|)), that x[i] < y[i], and for any j (0 ≤ j < i) x[j] = y[j]. Here, |a| denotes the length of the string a.