//------------
// Introduction to Programming Using Java: An Object-Oriented Approach
//	Arnow/Weiss
//------------
// the accumulating loop
// Chapter 9, Section 9.6, Page 340
// MODIFICATIONS:
//    We have placed the loop in a main method and provided a BufferedReader
//    in a variable named br
//    We have added a print of the concatenated string after the loop

import java.io.*;

public class Demo_accumulating {
	public static void main(String[] a) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		////////////////////////////////////////////////////////////////////
		String s = "";
		String line;
		line = br.readLine();
		while (line!=null) {
			if (line.substring(0,1).equals(":"))
				s = s.concat(line);
			line = br.readLine();
		}
		////////////////////////////////////////////////////////////////////
		System.out.println(s);
	}
}

// Here is some sample input for this program:
// this will be ignored
// : Disney
// : McDonalds
// This line will be ignore too
// : General Electric
// : Citigroup