程序提示用户输入一行字符串（字符个数不超过80个，该字符串用回车符结束）。并按字母，数字及其他字符分类计数，然后将结果存入以char、digit和other为名的存储单元
字符串转换所需最短的编辑距离(The program prompts the user to enter a string of characters (no more than 80 characters, and the string ends with carriage returns). It is classified and counted according to letters, numbers and other characters, and then the results are stored in the storage units in the name of char, digit and other
The shortest edit distance required for string conversion)