Input: MATH, LEAD, RUSH, COAT
Step 1: NMSDGCGS
Step 2: CDGGMNSS
Step 3: BCFFLMRR

Output: GOAT, SOFT, LAKH, RICE

In the first step, all the first alphabets of the four words are taken and their immediate next alphabet is written and in the second half, the last alphabet is taken and their immediate previous alphabet is written.

In step 2, the outcome of the step 1 is arranged in increasing order according to alphabet set.

In step 3, all the alphabets are changed with their respective and immediate previous alphabets.

Now, Input : GOAT, SOFT, LAKH, RICE

STEP 1: HTMSSSGD

STEP 2: DGHMSSST

STEP 3: CFGLRRRS

Hence, the output will be CFGLRRRS