15. Reverse a given number

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int rev = 0;
        while (n!=0){
            int last = n%10;
            rev = rev * 10 + last;
            n /=10;
        }
        System.out.println(rev);
    }
}