How to count letters?? Help

Question

I figured out how to count letter A in array, but now how to count letters in given char array? Code should count number of every letter, like if I will input: AZZAB. It should output(in alphabet order) :
A 2
B 1
Z 2
https://code.sololearn.com/cfyHXe4BzpH0/?ref=app

Answer 1

Sort the array and check the number of times the same element you get increase the counter

Answer 2

Martin Taylor do you know how to output letter and its number without using range based loop?