Prawie dobrze

Musisz dodać linijke: else if (a!=b && a!=c && b!=c){ }

I would recommend going over your if statements and checking the logic. There is one clear mistake that is preventing validation, and along with that you can remove three other boolean checks. The way that the double ampersand (&&) AND logic works is that each statement is checked from left to right until 1 returns false. This means that it will only continue as long as each statement returns true. Having checks like this: (a==b && a !=b) will never return true because they are polar opposites of each other. Having a check like (a==b && a!=c && b!=c), you do not need to check "b != c" because the first check "a == b", if true, and "a != c", if true, would mean that would never be true. This means that, because if one if the prior checks returns false it won't be reached, if it is reached it will always be true. I would also recommend that you think a little about the flow of the program. If you think about this it would make sense to check if all of the numbers are the same in the first 'if' check, and if that is false you don't need to check that the third is not the same on any of the other checks (because the first 'if' would have captured it).

if(all three)
   print(all three)
else if(check first 2)
   print(first 2)
else if(check other 2)
   print(other 2)
else (check last 2)
   print(last2)

In that structure there would only be a total of 5 equality boolean checks (==). I would recommend going over your if statements and checking the logic. There is one clear mistake that is preventing validation, and along with that you can remove three other boolean checks.