Help me in solving LOOP9V2 problem

My issue

Is it important to mention the array elements in double quotes why is it giving error in using single char please tell.

My code

#include <bits/stdc++.h>
using namespace std;

int main(){
  string x[6] = {'C','O', 'D', 'I', 'N', 'G'};
    for(int i=0;i<6;i++){
        cout<<i<<" = "<<x[i]<<endl;
    return 0;

Learning course: Learn C++
Problem Link: CodeChef: Practical coding for everyone

Its because u have declared array of type string and strings have to be int “” .
If u declare an array of char type then u can put elements in ‘’.