输入一个字符串，扫描该字符串，按数字、字母和特殊字符3类，把字符分类输出到屏幕，并计算其中数字字符的和，把求得的和以十进制数的形式输出到屏幕。-Enter a string, the string scanning, numbers, letters and special characters are three types of character output to the screen, and calculate one of the numeric characters, to obtain the output in the form of a decimal number to the screen.