On the 11-(10-1)th of Febr(10-2)uary, 2006(10-3) the conte(10-4)st "Timus (10-5)Top Coders(10-6): First Ch(10-7)allenge" i(10-8)s held!
The exemple of this problem is wrong,isn't it?

Example is correct:
On the 11-<1>th of February<2>, 2006 the <3>contest "T<4>imus Top Coders<5>: First Ch<6>allenge" i<7>s held!<8>

you are very very very bad man,
 the correct answer to example is:
On the 11-<1-10>th of February<2-14>, 2006 the<3-10> contest "<4-10>Timus Top Coder<5-15>s: First C<6-10>hallenge" <7-10>is held!<8>

in your example ", 2006 the " 11 simbols!!!
after your explain I think that spaces in begin of sms must delete and I always have WA4!