First, I had an interview with an HR employee via Skype. It was a non-technical interview; I talked generally about my studies and the latest projects I had worked on. At one point during the call, the HR employee asked me a kind of puzzle, and I had to think out loud to solve it. It's not a problem if you don't succeed in answering it, but try to do your best.

A few weeks later, I had an interview at the HQ in Dublin. I met three to four different interviewers, and each asked me to solve a small algorithm problem. You had to explain your thoughts out loud again. You were provided with a whiteboard to write your pseudocode or real code. You could choose whatever language you wanted.

Code a function that outputs an integer or a double when a string representing a number is given as input.