Search and get position of a word in a comma separated string

[kll]

double post

Find number in a text and return string from the row below

for example I have a text that contains 2 lines 1- “1000”, “55”, “123” 2- “hello”, “bye”, “good” I want a function that does this foo (“55”) this would have to find me the string “55” and return what is in the row below, in this case “bye” How do I do this without using Table?