int ran;
void setup() {
  Serial.begin(9600);
  randomSeed(analogRead(A0));

  ran = random(123, 987);
  int d1 = ran / 100;
  int d2 = (ran / 10) % 10;
  int d3 = ran % 10;
Serial.println(ran);
  Serial.print(char(d1+97));
  Serial.print(char(d2+97));
  Serial.println(char(d3+97));
}
int num1,num2,num3;
void loop(){
  if(Serial.available()){
    String a = Serial.readString();
    num1=(int)a[0] - 97;
    num2=(int)a[1] - 97;
    num3=(int)a[2] - 97;


    Serial.print(num1);
    Serial.print(num2);
    Serial.println(num3); 
  }
}