# ,----------------, ,---------,
# ,-----------------------, ," ,"|
# ," ,"| ," ," |
# +-----------------------+ | ," ," |
# | .-----------------. | | +---------+ |
# | | | | | | -==----'| |
# | | I LOVE study! | | | | | |
# | | Bad command or | | |/----|`---= | |
# | | C:\>_ | | | ,/|==== ooo | ;
# | | | | | // |(((( [33]| ,"
# | `-----------------' |," .;'| |(((( | ,"
# +-----------------------+ ;; | | |,"
# /_)______________(_/ //' | +---------+
# ___________________________/___ `,
# / oooooooooooooooo .o. oooo /, \,"-----------
# / ==ooooooooooooooo==.o. ooo= // ,`\--{)B ,"
# /_==__==========__==_ooo__ooo=_/' /___________,"
#
# .-~~~~~~~~~-._ _.-~~~~~~~~~-.
# __.' ~. .~ `.__
# .'// 学习使我快乐 \./ 但不学习我会更快乐\\`.
# .'// | \\`.
# .'// .-~"""""""~~~~-._ | _,-~~~~"""""""~-. \\`.
# .'//.-" `-. | .-' "-.\\`.
# .'//______.============-.. \ | / ..-============.______\\`.
# .'______________________________\|/______________________________`.