In Python, I'm trying to write code that converts one of those lettered telephone numbers (such as 555-GET-FOOD) to its corresponding numeric telephone number. I've attached my code and the result i get. I'm confused -- why aren't the letters being converted to the numbers I have in the loop? How would I fix this?

For example, 555-GET-FOOD should end up printing 555-438-3663

num-input ("Enter a telephone number in the format xxx-xxx-xXXX: split_num-num. split(-' new num- for ch in split num: if ch.upper) in 'ABC': elif ch.upperin 'DEF': elif ch.upperin 'GHI': elif ch.upperin 'JKL' elif ch.upper ) elif ch.upper) in 'PQRS elif ch.upper ) in 'TUV elif ch.upper ) in 'WXYZ ch= ' 2 ' ch= ' 3 ' 10 12 ch= ' 5' 14 15 16 17 18 19 20 21 n 'MNO' ch-7 ch-'8 ch= ' 9' new num+-ch 23 24 print (new_num)