#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27,16,2);
int green=5;
int red=12;
int sw=6;
int flag=0;
void setup()
{
 lcd.init();
 lcd.backlight();
 pinMode(green, OUTPUT);
 pinMode(red, OUTPUT);
 pinMode(sw, INPUT);
  // put your setup code here, to run once:

}

void loop() {
  int push=digitalRead(sw);
  if(push==1 && flag==0)
  {
    digitalWrite(green, HIGH);
    delay(1000);
    digitalWrite(red, LOW);
    delay(1000);
    flag=1;
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("green : on");
    lcd.setCursor(0,1);
    lcd.print("red : off");
  }
  else if(push==1 && flag==1)
   {
     digitalWrite(green, LOW);
    delay(1000);
    digitalWrite(red, HIGH);
    delay(1000);
    flag=1;
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("green : off");
    lcd.setCursor(0,1);
    lcd.print("red : on");
   } // put your main code here, to run repeatedly:

}