StringBuffer

What will be the result of compiling and running the following program? public class App1 { public static void main(String[] args) { System.out.println(addToString("12345678910",',')); } public static StringBuffer addToString(String s, char c) { StringBuffer b = new StringBuffer(s); int p = 0; for (int i = 1; i < b.length(); i++) { if (i%3 == 0) { b.insert(b.length()-i-p, c); p++; } } return b; } }