Read the following alphabet series and answer the given question:

L Z R J K R S J L Z T J Z N Z J S T L Z R N S

The alphabet that comes the least number of times in the series is

K

L Z R J K R S J L Z T J Z N Z J S T L Z R N S.

The alphabet that comes the least number of times in the series is "K". It has only been used once in the given series.