HSBC Trainee Software Engineer interview questions

First he asked to introduction Then asked the frontend and backend for the projects i have mentioned in the resume I have done a project using GUI he asked me to write GUI code Then asked about difference between python and Java Gave a coding question ,like in a list there are elements like [ A 4 Y F U P 3 1 6,9] OUTPUT :[(Y,1)(U,3)(P,4)(F,6)(A,9)] Alphabets in descending order Numbers in ascending order Then operating system concepts Why HSBC?