你的工作是把它们按字母编组，再把它们按数字顺序排序。
Your job is to group them by letter and put them in numerical order.
清单14中的第二个例子显示对第一个字段按照数字顺序排序，而对第二个字段按照字母顺序排序。
The second example in Listing 14 shows sorting the first field numerically and the second by collating sequence (alphabetically).
我目前最长的比赛是 103.6 公里（尽管我个人从没有跑过甚至与此接近的距离），按字母顺序读取小数点前面的三个数字。
My longest race currently is 103.6 miles (although I've personally never come close to running this distance!), which reads lexicographically as three digits to the left of the decimal point.
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