A 1 B 2 C 3d4e5f6g7h8i9j10k11l12m13 2025. Convert numbers to letters in various formats. Tool to convert letters to numbers and vice versa using the alphanumeric code a1z26 (a=1, b=2, c=3).
Map lettermap = new hashmap<>(); Here are some solutions i could think of but nothing that does it in given constraints.