 InglishNumber Translator程序怎么编写

Description
In this problem, you will be given one or more integers in English. Your task is to translate these numbers into their integer representation. The numbers can range from negative 999,999,999 to positive 999,999,999. The following is an exhaustive list of English words that your program must account for:
negative, zero, one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety, hundred, thousand, million
InputThe input consists of several instances. Notes on input:
Negative numbers will be preceded by the word negative.
The word "hundred" is not used when "thousand" could be. For example, 1500 is written "one thousand five hundred", not "fifteen hundred".The input is terminated by an empty line.
OutputThe answers are expected to be on separate lines with a newline after each.
Sample Inputsix
negative seven hundred twenty nine
one million one hundred one
eight hundred fourteen thousand twenty twoSample Output
6
729
1000101
814022