Note: Main.java uses unchecked or unsafe operations Error Coming

#1

What is the problem in my code

import java.util.*;

public class Main {
public static void main(String args[])throws Exception {
Scanner sc = new Scanner(System.in);
ArrayList l = new ArrayList();
String no = sc.next();

	int sum = 0;

	// 139263
	for (int i = 0; i < no.length(); i++) {
        char num =no.charAt(i);
        sum = 9-Character.getNumericValue(num);
        
        if(sum<Character.getNumericValue(num)) {
           l.add(sum);	
        }
        else {
        	l.add(num);
        }
        
	}
	for (Object object : l) {
		System.out.print(object);
	}

}

}

#2

Hey @nigamshubham1998 define type of ArrayList
like
ArrayList l = new ArrayList<>();

#3

You are adding int and character to the same ArrayList. These things are wrong