import java.util.stream.*;
import java.util.*;
import java.lang.*;
import java.io.*;
 
class Main {
	public static String getInitials(String name) {
		return Arrays.stream(name.split(" ")).map(s -> s.subSequence(0, 1)
			).collect(Collectors.joining());
	}
	public static void main (String[] args) {
		String[] names = {"Vladimir Putin", "Dmitry Medvedev"};
		Arrays.stream(names).map(name -> getInitials(name)
			).forEachOrdered(initials -> System.out.println(initials));
	}
}

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