1750. Minimum Length of String After Deleting Similar Ends

class Solution {
    public int minimumLength(String s) {
        int n=s.length();
        char[] a=s.toCharArray();
        int length=n;
        int i=0,j=n-1;
        while(i<j){

            if(a[i]!=a[j]){
                break;
            }
            else{
                char c=a[i];
                while(i<j&&a[i]==c) {
                    i++;
                    length--;
                }
                char d=a[j];
                while(j>=i&&a[j]==d) {
                    j--;
                    length--;
                }


            }

        }
        return length;
        
            
    }
}