In a code language, NEEDLE is written as MFDEKF. How will HAMMER be written in the same language?

$$N\ \underrightarrow{-1} \ M$$

$$E \ \underrightarrow{+1} \ F$$

$$E\ \underrightarrow{-1} \ D$$

$$D\ \underrightarrow{+1} \ E$$

$$L\ \underrightarrow{-1} \ K$$

$$E\ \underrightarrow{+1} \ F$$

So respective pattern word is MFDEKF

 Similarly  HAMMER

$$H\ \underrightarrow{-1} \ G$$

$$A \ \underrightarrow{+1} \ B$$

$$M\ \underrightarrow{-1} \ L$$

$$M\ \underrightarrow{+1} \ N$$

$$E\ \underrightarrow{-1} \ D$$

$$R\ \underrightarrow{+1} \ S$$

So next pattern will be GBLNDS