Java String Builder Problem.

I need the second input found in the StringBuilder to be converted to uppercase. The second input should be capitalized and if those same letters are found in the first string then they should be converted to uppercase letters. See required input and output below.

Must use the class public class demo2 below.

import java.util.Scanner; public class CaseDemo2 { public static void main(String[] args) { Scanner keyboard = new Scanner(System.in); System.out.println("Enter some String"); StringBuilder sb = new StringBuilder(keyboard.nextLine()); System.out.println("Which letters should be converted to uppercase?"); String chars = keyboard.nextLine(); ParsingUtils.changeLetter(sb, chars); System.out.println(sb); } } 

Standard Input
aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz abcxyz

Required Output

Enter a String Which characters should be converted to uppercase? AABBCCddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwXXYYZZ 

Standard Input
aaabbbcceeefghj abc

Enter a String Which characters should be converted to uppercase? AAABBBCCeeefghj