字符统计：从键盘输入一系列字符（以回车符结束），并按字母、数字及其他字符分类记数，最后显示出这三个记数结果。-Character Statistics: a series of characters from the keyboard input (to the end of carriage return), and letters, numbers and other characters in mind the number of categories, and finally show the results of the three counting.