Problems
Quite a problem
Quite a problem
It gets tiring, looking for all ways in which the word ‘problem’ can be used (and mis-used) in the news media. And yet, that’s been your job for several years: looking through news stories for that word. Wouldn’t it be better if you could automate the process?
\InputFile
Each line of input is one test case. Lines are at most \textbf{80} characters long. There are at most \textbf{1000} lines of input. Input ends at end of file.
\OutputFile
For each line of input, print yes if the line contains 'problem', and no otherwise. Any capitalization of 'problem' counts as an occurrence.
Input example #1
Problematic pair programming "There's a joke that pairs, like fish and house guests, go rotten after three days," said Zach Brock, an engineering manager. Working out problems with a pairing partner can be a lot like working out problems with a significant other. During one recent rough patch, Jamie Kite, a developer, sat her partner down for a talk. "Hey, it feels like we're driving in different directions," she recalls saying. "It's like any relationship," Ms. Kite said. "If you don't talk about the problems, it's not going to work." When those timeouts don't solve the problem, partners can turn to on-staff coaches who can help with counseling. "People who have been pairing a while, they'll start acting like old married couples," said Marc Phillips, one of the coaches. People can be as much of a challenge as writing software. (Excerpted from "Computer Programmers Learn Tough Lesson in Sharing"; Wall Street Journal, August 27, 2012)
Output example #1
yes no no yes yes no no no no yes yes no no no no no no