Need some hint to start problem solving

#1

please give me some hint to start problem solving

#2

@711tri You have a mapped string and are provided a number now you need to find the possible strings that can be created. You can do this recursively take the digit write its mapped string make a recursive call for remaining, then take the digit and adjacent digit and make the recursive call for remaining.
eg Number is 123
1- A call for(23)
2-B call for(3)
3 C
String ABC
returning to 2, take 23 -W
String AW
return to 1
Take 12 call 3
12- L ,3=C
String LC

Final answer
ABC
AW
LC