Except one (Brygada Kryzys)

If you find a key to every door except one if you win every war except one if you solve all your problems except one if you find every answer except one don't come to me don't ask me why 'cos I don't know... 'cos I have found a key to every door except one and I have won every war except one and I have solved all my problems except one and I have found every answer except one so don't come to me don't ask me why 'cos I don't know