Find Minimum Operations (It seems for FT in US but intern in CN)

Amazon Web Services (AWS) manages grayscale images using sequences of black and white pixels. Each image is represented as a binary string where '1' indicates a white pixel, and '0' represents a black pixel. The reverse of an image is simply the binary string in reverse order. For example, reversing "11010" results in "01011."

To maintain backups, AWS plans to generate the reverse of each image. You can perform a specific operation any number of times to achieve this: select any character from the string, remove it, and append it to the end. This operation mimics shifting a pixel to the back of the string.

Your goal is to determine the minimum number of operations required to convert the original binary representation of the image into its reversed version.