문제 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? 입력 Each line of input is one test case. Lines are at most 80 characters long. There are at most 1000 lines of input. Input ends at end..