PND From Code Avengers ,I think My program works correctly but codechef is prompting it as "wrong answer",please can somebody help?

import java.io.*;
class dec
{
public static void main(String ar[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int t=Integer.parseInt(br.readLine());
int a[]=new int[t];
char dig[]={‘0’,‘1’,‘2’,‘3’,‘4’,‘5’,‘6’,‘7’};
int i,j;
String s="",w="";
int r;
int c[]=new int[t];
if(t>=1 && t<=64)
{
for(i=0;i<t;i++)
{
a[i]=Integer.parseInt(br.readLine());
while(a[i]>0)
{
r=a[i]%8;
s=dig[r]+s;
a[i]=a[i]/8;

            }
    
            for(j=0;j<s.length();j++)
            {
                w=s.charAt(j)+w;
        
            }
   

            if(s.compareTo(w)==0)
            {c[i]=1;}
    }

    for(i=0;i<t;i++)
    {
        if(c[i]==1)
        {
            System.out.println("1");
        }
    else
    {   System.out.println("-1");
    }

}
}
}
}

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