Terrible Chandu From Hacker Earth

Chandu is a bad student. Once his teacher asked him to print the reverse of a given string. He took three hours to solve it. The teacher got agitated at Chandu and asked you the same question. Can you solve it?

Input:
The first line contains an integer T, denoting the number of test cases.
Each test case contains a string S, comprising of only lower case letters.

Output:
For each test case, print the reverse of the string S.

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class TerribleChandu {

public static void main(String[] args) 
{

Scanner scn=new Scanner(System.in);

System.out.println("Type Test cases");

int n=scn.nextInt();

String s1="";

String [] str=new String[n];

List<String> list=new ArrayList();

for(int i=0;i<str.length;i++)
    {

list.add(scn.next());

}

for(String l:list) 
     {

System.out.println(reverse(l.toLowerCase()));

}

}

public static String reverse(String str)
{

String nstr="";

char c;

for(int i=str.length()-1;i>=0;i--)
     {

c=str.charAt(i);

nstr+=c;

}

return nstr;

}

}