poj2880 输入一个英文句子，长度不超过40个字符。编写程序，输出句子中最长的一个单词。 http://poj.grids.cn/problem?id=2880 可直接运行-poj2880 enter an English sentence, the length of not more than 40 characters. Programming, the output of a sentence in the longest word. http://poj.grids.cn/problem?id=2880 can be directly run