12 August "Problem of the Day" Answer

                                                                   GeeksforGeeks
                                                           
The Question is :- "Case-specific Sorting of Strings"
Answer :-

class Solution
{
    public:
    //Function to perform case-specific sorting of strings.
    string caseSort(string str, int n)
    {
        // your code here
        string low="",up="";
        for(char ch : str)
        {
            if(ch>='a' && ch<='z')
            low+=ch;
            else
            up+=ch;
        }
        sort(low.begin(),low.end());
        sort(up.begin(),up.end());
        for(int i=0,j=0,k=0;i<n;i++)
        {
            if(str[i]>='a' && str[i]<='z')
            {
                str[i]=low[j];
                j++;
            }
            else
            {
                str[i]=up[k];
                k++;
            }
        }
        return str;
    }
};

Hope you understand the answer, and complete it.
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