How to get rid of getting NZEC error while submitting solution in java?

I DONT UNDERSTAND WTF IS WRONG IN MY CODE ITS PERFECTLY WORKING ON JDK 9
AND CODECHEF IS SAYING IT HAS NZEC RUNTIME ERROR
/*

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    /
    import java.io.
    ;
    import java.util.*;

/**
*

  • @author Aashlesh Dhumane
    */
    public class Main {

    /**

    • @param args the command line arguments

    • @throws java.lang.Exception
      */
      public static void main(String[] args) throws Exception
      {
      // TODO code application logic here
      int n;
      int i,j,k,l;
      System.out.println(“enter the test cases”);
      String str;
      BufferedReader b = new BufferedReader (new InputStreamReader(System.in));
      str=b.readLine();
      n=Integer.parseInt(str);
      // for (i=0;i<n;i++)
      // {
      while (n>0)
      {
      str=b.readLine();
      i=Integer.parseInt(str);
      str=b.readLine();
      j=Integer.parseInt(str);
      str=b.readLine();
      k=Integer.parseInt(str);
      str=b.readLine();
      l=Integer.parseInt(str);

        if ((i==j && k==l) || (j==k && l==i) || (i==k && j==l) )
       {System.out.println("YES");
       }
        else 
       { System.out.println("NO");
       }
                   n--;     
      

      }

      }

}

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