int digit[]={0x3f,0x06,0x5B,0x4f,0x66,0x6d,0x7d,0x7,0x7f,0x6f};
int x = 0;


void setup() {
DDRD=0xFF;
PORTD=0x80;

randomSeed(analogRead(A0));
x= random(4,9);
}

void loop() {
  int k = digit[x];
  pinMode(7, INPUT_PULLUP);

  if(digitalRead(7) == LOW && x>0){
    x--;
    delay(300);
  }

for(int x = 0 ; x<7;x++){
  int temp = k ;
  digitalWrite(x+1,temp);
  k=k>>1;
}
}