int led1 = 2;
int led2 = 3;
int led3 = 4;
int led4 = 5;
int led5 = 6;
int led6 = 7;
int led7 = 8;
int led8 = 9;
int led9 = 10;
int led10 = 11;
int boton = 12;

void setup() {
    pinMode(led1, OUTPUT);
    pinMode(led2, OUTPUT);
    pinMode(led3, OUTPUT);
    pinMode(led4, OUTPUT);
    pinMode(led5, OUTPUT);
    pinMode(led6, OUTPUT);
    pinMode(led7, OUTPUT);
    pinMode(led8, OUTPUT);
    pinMode(led9, OUTPUT);
    pinMode(led10, OUTPUT);
    pinMode(boton, INPUT);
    Serial.begin(9600);
}

void loop() {
    if(digitalRead(boton) == HIGH){
        digitalWrite(led1, HIGH);
        digitalWrite(led2, HIGH);
        digitalWrite(led3, HIGH);
        digitalWrite(led4, HIGH);
        digitalWrite(led5, HIGH);
        digitalWrite(led6, HIGH);
        digitalWrite(led7, HIGH);
        digitalWrite(led8, HIGH);
        digitalWrite(led9, HIGH);
        digitalWrite(led10, HIGH);
        Serial.println("10");
        delay(1000);
        digitalWrite(led10, LOW);
        Serial.println("9");
        delay(1000);
        digitalWrite(led9, LOW);
        Serial.println("8");
        delay(1000);
        digitalWrite(led8, LOW);
        Serial.println("7");
        delay(1000);
        digitalWrite(led7, LOW);
        Serial.println("6");
        delay(1000);
        digitalWrite(led6, LOW);
        Serial.println("5");
        delay(1000);
        digitalWrite(led5, LOW);
        Serial.println("4");
        delay(1000);
        digitalWrite(led4, LOW);
        Serial.println("3");
        delay(1000);
        digitalWrite(led3, LOW);
        Serial.println("2");
        delay(1000);
        digitalWrite(led2, LOW);
        Serial.println("1");
        delay(1000);
        digitalWrite(led1, LOW);
        Serial.println("0");
    }
}