Your word is my word

Sandeep, Ashok and Mohan were sitting together. Sandeep and Ashok decided to pass their free time by quizing each other. Ashok asked Sandeep to think of any word. Once Sandeep did this, Ashok thought of a word of his own. He then proceeded to convert his word into Ashok's word by shifting the alphabets of Sandeep's word. They then kept doing this by interchanging their roles. Mohan didnt know whe