This is a reverse coding challenge. Normally you're given explicit directions with how to create a function. Here, you must generate your own function to satisfy the relationship between the inputs and outputs.
Your task is to create a function that, when fed the inputs below, produce the sample outputs shown.
"A4B5C2" ➞ "AAAABBBBBCC"
"C2F1E5" ➞ "CCFEEEEE"
"T4S2V2" ➞ "TTTTSSVV"
"A1B2C3D4" ➞ "ABBCCCDDDD"
If you get stuck, check the Comments for help.