In a certain code language NATIONALISM is written as OINTANMSAIL. How is DEPARTMENTS written in that code?

Divide the word into two groups of five letters each. The first five letters are in group I and the last five letters are in group II. Now, for its coding the middle letters remain unchanged. While the letters in each group change their position as 1 → 3, 2 → 5, 3 → 4, 4 → 2 and 5 → 1.