import java.util.Scanner;

public class SubcadenaV {
  public static void main (String[] args) {
    Scanner lector = new Scanner(System.in);

    System.out.println("Escriu una frase:");
    String frase = lector.nextLine();

    int primeraV = frase.indexOf("v");
    int darreraV = frase.lastIndexOf("v");

    if (primeraV == -1) {
      System.out.println("No hi ha cap \"v\".");
    } else if (primeraV == darreraV) {
      System.out.println("Només hi ha una \"v\".");
    } else {
      System.out.println(frase.substring(primeraV, darreraV + 1));
    }
  }
}