import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.Arrays;
public class Main {
    //Program start

    //Program end

    @Test
public void test1() {
    assertEquals("cdcd", minCostGoodCaption("cdcd"));
}
@Test
public void test2() {
    assertEquals("aca", minCostGoodCaption("aca"));
}
@Test
public void test3() {
    assertEquals("bc", minCostGoodCaption("bc"));
}

}