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/* 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
	{
		String s1="ankita";
		for(int i=0;i<s1.length();i++)
		{
			s2=s.charAt(i)+s1;
		}
		System.out.print(s2);
		// your code goes here
	}
}

Main.java:15: error: cannot find symbol
			s2=s.charAt(i)+s1;
			^
  symbol:   variable s2
  location: class Ideone
Main.java:15: error: cannot find symbol
			s2=s.charAt(i)+s1;
			   ^
  symbol:   variable s
  location: class Ideone
Main.java:17: error: cannot find symbol
		System.out.print(s2);
		                 ^
  symbol:   variable s2
  location: class Ideone
3 errors

Standard output is empty