char data;
char *z[]={"welcome mk mk !","welcome you !","welcome me !","no data"};
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
Serial.println("===============================");
Serial.println("+INPUT 1 TO welcome mk mk !");
Serial.println("+INPUT 2 TO welcome you!");
Serial.println("+INPUT a TO welcome me!");
Serial.println("+INPUT another key for no data!");
Serial.println("===============================");
}
void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available()){
    char data=Serial.read();
    if (data == '1'){

      Serial.println(z[0]);
    }
     else if (data == '2'){
      Serial.println(z[1]);
  }
  else if (data == 'a'){
      Serial.println(z[2]);
}
else  {
      Serial.println(z[3]);
}
  }
}