import java.util.Arrays;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Iniciales {

    public static void main(String[] args) {
        Scanner entrada = new Scanner(System.in);
        try {
            System.out.println("Ingrese una frase:");
            String frase = entrada.nextLine();
            System.out.println(Arrays.asList(frase.split(" ")).stream().map(s -> s.substring(0, 1)).collect(Collectors.joining("")));
        }
        finally {
            entrada.close();
        }
    }

}