char Str4[]="Arduino";
char Str5[10]="Arduino";
char Str6[15]="Arduino";

void setup() {
  Serial.begin(9600);
}

void loop() {
  
  for(int i=10; i>-1; i--){
    Serial.print(Str5[i]);
    Serial.print(" ");
    delay(200);
    if (i==0){
     Serial.print(char(10));
     Serial.print(char(13));
    }
  }
}