Okay, now I don’t want to scare you, but I must introduce a new letter in Russian, which is:
The difference is only the little tail on the right. What about this letter? Well, it is like ш version 2.0, because it is like the letters ш and ч combined. It is pronounced shch.
There are few words with this monster, but do try some.
For example, a cheek is shchjeka (that's only four letters in Russian) and you can write it down: