Sequence Completion Puzzle with Answer

Here is the puzzle to tickle your brain. In this puzzle sequence of letters is given and your challenge is to find the next three letters in this sequence. Can you complete this sequence?

Can you complete the sequence?

The answer to this "Sequence Completion Puzzle"  can be viewed by clicking on the button. Please do give your best try before looking at the answer.

The Answer is PSU. Next letter for each of these three letters is a 5th letter in the forward in alphabetically.

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