#define Lai 26
#define Zahra 25
#define Zatil 27
#define Aqmar 33
String a;
String b;
String c;
void setup() {
  Serial.begin(115200);
  pinMode(Lai, OUTPUT);
  pinMode(Zahra, OUTPUT);
  pinMode(Zatil, OUTPUT);
  pinMode(Aqmar, OUTPUT);
  a="hello";
  b="world";
  c=a+b;
}
void loop() {
  Serial.println("hello world");
  delay(1000);
}