/**
 * A library that supports various program execution services.
 */
class Sys {

    /** Performs all the initializations required by the OS. */
    function void init() {
		do UART.init(4098);
		do UART.writeChar(71);
		do UART.writeChar(79);
		while (true){
			do UART.writeChar(UART.readChar());
		}
		return;
	}

}