Problems Description
<p class="p0"> <span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';">输入一items英文句子，把句子中的单词</span><span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';">(不区pointsSize写)</span><span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';">按出现次数按从多到少把单词和次数在屏幕上输出来，要求能识别英文</span><span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';">句号</span><span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';">和逗号，即是说</span><span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';">单词由空格、句号和逗号隔开。</span><span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';"></span> </p>
Input格式
<p class="p0"> <span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';">输入有若干行，Total不超过1000items字符。</span><span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';"></span> </p>
Output格式
<p class="p0"> <span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';">输出格式参见样例。</span><span style="font-size:10.5000pt;font-family:'SimSun-Identity-H';"></span> </p>
Sample
Sample Input 1
A blockhouse is a small castle that has four openings through which to shoot.
Sample Output 1
a:2
blockhouse:1
castle:1
four:1
has:1
is:1
openings:1
shoot:1
small:1
that:1
through:1
to:1
which:1
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