import java.util.Scanner;
public class SwitchingLetters {
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Please enter two numbers:");
int index1 = keyboard.nextInt() - 1;
int index2 = keyboard.nextInt() - 1;
keyboard.nextLine();
System.out.println("Please enter a sentence:");
String sentence = keyboard.nextLine();
System.out.println("The new sentence:\n" + switchLetters(index1, index2, sentence));
}
/* Switches letters according to given indexes. */
public static String switchLetters(int index1, int index2, String sentence) {
return sentence.substring(0,index1) + sentence.charAt(index2) + sentence.substring(index1 + 1, index2) + sentence.charAt(index1) + sentence.substring(index2 + 1, sentence.length());
}
}