输入有若干行，总计不超过1000个字符。
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输入有若干行，总计不超过1000个字符。
输出格式参见样例。
A blockhouse is a small castle that has four openings through which to shoot.
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
北京理工大学机试题