int butt1 = 7;  
int butt2 = 6;
int green = 11;
int yellow = 12;
int red = 13;
bool prev1 = 1;
bool prev2 = 1;

int A, B, iff1 = 0, iff2 = 0;

void setup(){
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(butt1, INPUT);
  pinMode(butt2, INPUT);
  digitalWrite(butt1, 1);
  digitalWrite(butt2, 1);
  Serial.begin(9600);
}

void loop(){
  A = digitalRead(butt1);
  B = digitalRead(butt2);
  if (A == 0 && prev1 == 1){
    iff1 = !iff1;
  }
  prev1 = A;

  if (B == 0 && prev2 == 1){
    iff2 = !iff2;
  }
  prev2 = B;

  digitalWrite(red, iff1);
  digitalWrite(green, iff2);
  digitalWrite(yellow, iff2);
  delay(30);
}