Answer:
See explanation.
Step-by-step explanation:
I don't know much about coding (I'm assuming you want to code the solution to the puzzle since this question was placed under engineering), but I can explain the logic behind the puzzle.
This puzzle has assigned the numbers 1-26 to every letter in the alphabet. The catch is every other word swaps the order of the numbers assigned. The first, third, etc words have A=1 and Z=26, while the second, fourth, etc words have A=26 and Z=1. Using the "two words" as an example:
Two words: 202315 4129238 -> 20 23 15 _ 4 12 9 23 8
First word (A=1 etc): 20 = T, 23 = W, 15 = O
Second word (A=26 etc): 4 = W, 12 = O, 9 = R, 23 = D, 8 = S
Using this reasoning to decode the given puzzle:
9 426137 2015 22137229 2085 141811 9142051814198916
Separating letters: 9 _ 4 26 13 7 _ 20 15 _ 22 13 7 22 9 _ 20 8 5 _ ??? _ 9 14 20 5 18 14 19 8 9 16
First word: 9 = I
Second word: 4 = W, 26 = A, 13 = N, 7 = T
Third word: 20 = T, 15 = O
Fourth word: 22 = E, 13 = N, 7 = T, 22 = E, 9 = R
Fifth word: 20 = T, 8 = H, 5 = E
Sixth word: ???
Seventh word: 9 = I, 14 = N, 20 = T, 5 = E, 18 = R, 14 = N, 19 = S, 8 = H, 9 = I, 16 = P.
I couldn't make the sixth word make sense, however based on the context clues of the solved sentence it is an organization's name or acronym. The decoded sentence reads "I want to join the ??? internship."