You have unlimited attempts so just be methodical. Pick a symbol and use all slots for that symbol until you find one with a number other than zero. Now you have a symbol that's correct but you don't know which position it's in.Alice's Password PC code puzzle is too hard
Are there someone can explain to me to get easier ?
Now pick a different symbol and do the same until you get zero. This is your filler symbol that you're going to use to help figure out the position for the first one.
Now use 1 of the correct symbols and for the rest use the wrong symbol, shifting the position by 1 until you find the correct position. Now you know one symbol and it's correct position. Repeat until you have the others. Gets faster the more you have figured out. Probably not the optimal strategy but it's easy and fool proof.