While biking with your friend, you come to a fork in the road. You wonder why there's a fork in the road here, you don't remember seeing it before. Your friend and you decide to split up; you'll go left, he'll go right.
You keep biking. Time flies and you don't realize how dark it is. You seem lost. You see a glimpse of light coming from a house up a head. After you knock, you don't get an answer, so you decide to walk in the room. The door shuts closed behind you.
You frantically try to re-open the door, but it won't work. You see a lock pad telling you to input a 1-digit code. You see the cipher below:
7/7-7777/7777-777/7777-7/77-77/7777-777/7-7777/77777-777/7 77777/7777-7777/7777-7777/777-77/7 777/7-7/77-7777/77-77777/77777-7/777-77/7777-777/7
You feel sure that the answer must be
7, but you don't want to take any chances, since you see that you only have one chance to enter a number into the lock pad.
You solve the cipher with a piece of paper, enter a number into the lock pad, and walk right out. What number did you enter?
The use of the number
7will be used in almost all the steps in solving the cipher.