const int LEDR =25; 
const int LEDY =26; 
const int LEDG =27; 
void setup() 
{ 
 pinMode(LEDR, OUTPUT); 
 pinMode(LEDY, OUTPUT); 
 pinMode(LEDG, OUTPUT); 
} 
void loop() 
{ 
 digitalWrite(LEDR, HIGH); 
 digitalWrite(LEDY, LOW); 
 digitalWrite(LEDG, LOW); 
 delay(1000); // Wait for 1000 millisecond(s) 
 digitalWrite(LEDR, LOW); 
 digitalWrite(LEDY, HIGH); 
 digitalWrite(LEDG, LOW); 
 delay(1000); // Wait for 1000 millisecond(s) 
 digitalWrite(LEDR, LOW); 
 digitalWrite(LEDY, LOW); 
 digitalWrite(LEDG, HIGH); 
 delay(1000); // Wait for 1000 millisecond(s) 
}