/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int n = 9998;
		long timeMs = System.nanoTime();
		System.out.println(reverse(n) + " | " + (System.nanoTime()-timeMs));
		timeMs = System.nanoTime();
		System.out.println(reverseInt(n) + " | " + (System.nanoTime()-timeMs));
	}
 
	 private static int reverse(int n) {
        return Integer.parseInt(
            new StringBuilder(Integer.toString(n)).reverse().toString());
    }
 
     private static int reverseInt(int n) {
     	int rev = 0;
     	while(n>0){
     		rev = (rev*10)+n%10;
     		n=n/10;
     	}
        return rev;
    }
}

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