TextProcessor | Topcoder Archive

Problem Statement

You are given a String text. Determine the letters (both lowercase and uppercase) that appear in text. Return a String which contains those letters, converted to lowercase, and then sorted in alphabetical order. The returned String should include all occurrences of each letter.

Definition

Class:: TextProcessor
Method:: collectLetters
Parameters:: String
Returns:: String
Method signature:: String collectLetters(String text)
(be sure your method is public)

Constraints

text will contain between 1 and 50 characters, inclusive.
text will contain only letters ('A'-'Z', 'a'-'z'), digits ('0'-'9'), and spaces (' ').

Examples

```
"She sells sea shells"
```
```
Returns: "aeeeehhllllssssss"
```
The letters that appear in the input are "shesellsseashells" (converted to lower case and ignoring non-letter characters). Then we sort these letters alphabetically.

"ReMemBEr To IgnoRE CASe"

Returns: "abceeeeegimmnoorrrst"

```
"12345"
```
```
Returns: ""
```
There are no letters, so the empty String should be returned.

"TopCoder is fun"

Returns: "cdefinooprstu"

"Knights are better than Bishops"

Returns: "aabbeeeghhhiiknnoprrssstttt"

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