In the notebook, I suddenly began to type numbers and special characters insead of letters, so I have to use the Fn button to appear letters. Looks like as the Fn button is stucked and enabled.
Instead of the letter o I get 6, instead of i I type 5 , 4 instead of u, 1 instead of j, 2 instead of k, 3 instead of l, * instead of p, etc.. Damn it was hard to write google.si .
Solution
This is simply solvable (if you know) with a combination of buttons Fn + NumLk (number lock)