Whenever I legally download things that I have the right to, I make sure that I'm tunneled into some large American city where traffic is chaotic and the government can never track me. I actually stumbled across a city like that recently, and they had this dope cell tower mimicking a chimney! And where there's a cell tower, there's bound to be a telephone exchange. What is the CLLI shared by all the switches in the nearest exchange?

Enter your flag in the format: BCCTF{CLLI}