Write a java program (a1 b2 c3 d4) output: 1.a b c d 2.1+2+3+4

Program:

package programs;

import java.util.Scanner;

public class SwapTwoNumbers {

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = "a1 b2 c3 d4";
System.out.println(str.replaceAll("[0-9]",""));
System.out.println(str.replaceAll("[a-z]","").replaceAll("[\\s]","+"));

}

}

Output:

a b c d

1+2+3+4