Get the message (recon 300)

In this task somebody is telegraphing Olimpiada strange messages with secret password and we need to find that.

We found on Olimpiada's VK.com avatar image her phone number +37255933368 and allusion to the fact that we must use Telegram Messenger. Because of a lot of login requests Telegram started to discard connections. Organizers published message that she "...don't like telegram messenger any more!(( Good old sms rulezzz!"

So we found a service to read sms from public phones and read her messages. We got flag RUCTF_THE_MOST_SECRET_PA$$_3V3R from one of them.