int a = 5;
int b = 100;
void setup() {
  Serial.begin(9600);
}

void loop() {
  if (a + b > 90) {
    Serial.print(a);
    Serial.print("   ");
    Serial.println(b);
  }
  else {
    Serial.println("*****");
  }
  a = a + 2;
  b = b - 5;
  if(a>100) {
    a=100;
  }
  if(b<5) {
    b=5;
  }
}