First, we had an aptitude test. Shortlisted students then went through a coding round. After this, shortlisted candidates proceeded to face-to-face interview rounds. Depending on performance, people went through 3-4 rounds of interviews. Following these, there was another quick coding round with the final shortlist (one person was rejected in this round).

The question is: Given a text written in some language where the alphabets are represented with 1 byte or 2 bytes. The one-byte alphabets always have their MSB set to 1, and the two-byte characters always have their MSB set to 0. Now, when the user presses backspace, how many bytes are to be deleted to erase the alphabet?