char solution[] = {'a', 'b', 'b', 'a'};
int count = 0;
int solutionLength = 4;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}
void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available() > 0) {
    char Data = Serial.read();
    if (Data == solution[count]) {
      //      digitalWrite(outpin1,HIGH);
      if (count == solutionLength - 1) {
        Serial.print('y');
        count = 0;
      }
      else {
        Serial.print('p');
        count++;
      }
    }
    else {
      Serial.print('n');
      count = 0;

    }
    //    Serial.read();
  }

  delay(1000);
  //    digitalWrite(outpin1,LOW);
  //    digitalWrite(outpin2,LOW);
}