MANYCHEF why is my code showing wrong answer?

import java.util.Scanner;
import java.lang.*;
public class Main {
public static void main(String [] args) {
Scanner sc = new Scanner(System.in);
int t = sc.nextInt();
String chef = “CHEF”;
for(int k=0;k<t;k++) {
StringBuilder S = new StringBuilder(sc.next());
int j=0;
while(j<S.length()) {

            if(S.charAt(j) == '?' || S.charAt(j) == 'C') {
                int i=j;
                int value =0;
                while(j<S.length() && value<chef.length() &&(S.charAt(j) == '?'||S.charAt(j) == chef.charAt(value))) {
                    j++;
                    value++;
                }
                if(value == chef.length()) {
                    String newStr = S.substring(0,i)+chef;
                    if(i+chef.length() < S.length()) {
                        newStr += S.substring(i+chef.length(),S.length());
                    }
                    S= new StringBuilder(newStr);
                    
                } else {
                        if(S.charAt(i) == '?') {
                            S.setCharAt(i,'A');
                        }
                        j= i+1;
                }
                
            } else {
                j++;
            }
        }
        System.out.println(S);
    }
}

}

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