Every letter of the group HARP is replaced by the letter standing three places ahead of it in the English alphabet. What is the resulting group of letters?

H is the 8th letter, so three ahead gives the 11th, K. A (1st) gives D (4th), R (18th) gives U (21st), and P (16th) gives S (19th). The group is therefore KDUS. JCTR is the result of moving only two places ahead and LEVT of moving four. EXOM comes of moving three places back instead of forward, A having nothing three places behind it and so running round the end of the alphabet to X.