As we know, we often use a short sequence of characters in place of some words with a very long name. For example, ACM is an abbreviation of “Association for Computing Machinery”. Now we are using an acronymic method to get the abbreviation. An acronym is generated from a long name by capitalizing the first letter of every word in the name and concatenating them together. There is an exception: some words are ignored when generating the abbreviation. These words( case insensitive) meet the following rules:
1. The common words “and”, “for”, and “the”.
2. The words with length less than 3, such as “a”, “of”, “to”. Your job is to get the abbreviation of a given string by using the acronymic method.