import javax.swing.JOptionPane; 

public class Eserc1i{
    static public void main(String[] args){
	String ins = JOptionPane.showInputDialog("Inserisci una stringa");
	StringBuffer insb = new StringBuffer(ins);
	String first = ins.substring(0,1);
	String last = ins.substring(ins.length()-1,ins.length());
	insb.replace(0,1,last);
	insb.replace(insb.length()-1,insb.length(),first);
	System.out.println(insb);
	System.exit(0);
    }
}