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Problem Statement for "TextProcessor"

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

  1. "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.

  2. "ReMemBEr To IgnoRE CASe"

    Returns: "abceeeeegimmnoorrrst"

  3. "12345"

    Returns: ""

    There are no letters, so the empty String should be returned.

  4. "TopCoder is fun"

    Returns: "cdefinooprstu"

  5. "Knights are better than Bishops"

    Returns: "aabbeeeghhhiiknnoprrssstttt"

  6. " "

    Returns: ""

    Three spaces

  7. "aaaAAABBBBcccc"

    Returns: "aaaaaabbbbcccc"

    This test case makes sure that case is ignored.

  8. "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

    Returns: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

    50 x's

  9. "yxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxy"

    Returns: "xxxxxxxxxxxxxxxxxxxxxxxxyyyyyyyyyyyyyyyyyyyyyyyyy"

    25 y's and 24 x's

  10. "vfqscyeghaoniudxrmjbpklwzt"

    Returns: "abcdefghijklmnopqrstuvwxyz"

    A permutation of all letters.

  11. "eghi5urmlp4kfdwnoas2xjbvcytq7zXYZ3"

    Returns: "abcdefghijklmnopqrstuvwxxyyzz"

  12. "r2tpIF0Jl4Z7F2k4C29xqk5HFDyke2y6M64IpSKH"

    Returns: "cdefffhhiijkkkklmppqrstxyyz"

  13. "ArpW9NUGJl5sqF4LuZTNsNXCaKj0vIIOX"

    Returns: "aacfgiijjkllnnnopqrsstuuvwxxz"

  14. "B asgYSaoY961ff7mRu8y21Y2mG3P7ivzUCWW"

    Returns: "aabcffggimmoprssuuvwwyyyyz"

  15. "0vbWmOxNDaMh3rGd67qSLow2z1tsoTYtNPne"

    Returns: "abddeghlmmnnnooopqrsstttvwwxyz"

  16. "ICt56iz7v4SodMW1dUHymmgXTdh7rR"

    Returns: "cdddghhiimmmorrsttuvwxyz"

  17. "p nSCgUHBBPCZlMxB MkQEHcQoneA3XsbTp6vPGBS9pvoKOk7"

    Returns: "abbbbbccceegghhkkklmmnnooopppppqqssstuvvxxz"

  18. "v9K1gHESJTd L84FDl ZVV4BT6feKarHZE"

    Returns: "abddeeeffghhjkkllrsttvvvzz"

  19. "ku1"

    Returns: "ku"

  20. "d bT65G9MZitHjJRAiB2A "

    Returns: "aabbdghiijjmrttz"

  21. " ufRbiurJLUhnHk4bSKClHx0hJnMnI03RmtX1"

    Returns: "bbcfhhhhiijjkkllmmnnnrrrstuuuxx"

  22. "Dv0Tbb7bLtJqJI6vRnMCnMGTIt3nmktkry"

    Returns: "bbbcdgiijjkklmmmnnnqrrtttttvvy"

  23. "t0K2hDSYrE83UgPN6zn5bTRr5XuvHG sulQ9"

    Returns: "bdegghhklnnpqrrrssttuuuvxyz"

  24. "idgHkD2kTz"

    Returns: "ddghikktz"

  25. "Y Z2ZWw"

    Returns: "wwyzz"

  26. "Y28h7l8139a5H5Z59Y QkVFjEWcSAC2pr8TOb4Kyr"

    Returns: "aabccefhhjkklopqrrstvwyyyz"

  27. "Sx7Z4HlqUYn1y8yX"

    Returns: "hlnqsuxxyyyz"

  28. "e9 JQVH2y79VwFElxYt Quzumpgcg2GKeY"

    Returns: "ceeefggghjklmpqqtuuvvwxyyyz"

  29. "3vCG9LHFbhrPaExm5qP"

    Returns: "abcefghhlmppqrvx"

  30. "Y2sxIcqopFRf"

    Returns: "cffiopqrsxy"

  31. "IYCz7kKhzj7z2xzGztooQvPzZb0QEaBRYvzHA6XS3JSr1WIndg"

    Returns: "aabbcdegghhiijjkknoopqqrrsstvvwxxyyzzzzzzzz"

  32. "4GuTrOYVasfCAqWePzv5W"

    Returns: "aacefgopqrstuvvwwyz"

  33. "gfz0 20FFSuB0O26 vFeb"

    Returns: "bbeffffgosuvz"

  34. "h5tKakNIUhrNNjKcHfaRaaCSV2lNPM 9XjNE"

    Returns: "aaaaccefhhhijjkkklmnnnnnprrstuvx"

  35. "0k1pNeNt1HWKxx"

    Returns: "ehkknnptwxx"

  36. "aO4OLPJDjFmkamDvmSL3D1XH2AzMMb0RXsk932bxYZ"

    Returns: "aaabbdddfhjjkkllmmmmmooprssvxxxyzz"

  37. "Yb6Vvb6oAAEoq2bHJsyvfOxNjH "

    Returns: "aabbbefhhjjnoooqsvvvxyy"

  38. "Z8JLzxtfRQ"

    Returns: "fjlqrtxzz"

  39. "K2n49 FeW"

    Returns: "efknw"

  40. "Nrz1pYUYpr3y2FqqeY3TjnUaoCALgm8"

    Returns: "aacefgjlmnnoppqqrrtuuyyyyz"

  41. "dSL"

    Returns: "dls"

  42. "pLsngPVhu6xHWfo8"

    Returns: "fghhlnoppsuvwx"

  43. "w3fsgVOqtgIxY05gfa7c2 zQ87 lG6"

    Returns: "acffggggiloqqstvwxyz"

  44. "bDCmCevIq27Npr3d4gGchqEuSqsRdONPORwBJUmNj B3pg"

    Returns: "bbbcccdddeeggghijjmmnnnoopppqqqrrrssuuvw"

  45. "ZSth"

    Returns: "hstz"

  46. "N6Nvc0N2Wt5ksBiH5Cit4NB2fsf njVQYdUZtpKo5OWM kO"

    Returns: "bbccdffhiijkkkmnnnnnooopqsstttuvvwwyz"

  47. "1wdvlE0ObyrxMZIF4dnWdc3pqgyxj7NDxrtUBNBq5ayNzuv4"

    Returns: "abbbcddddefgijlmnnnnopqqrrtuuvvwwxxxyyyzz"

  48. "Z6jnOmuq"

    Returns: "jmnoquz"

  49. "7FnM4kgHguTTcRX4KmKkwFJOQxMuOKiWa jASk7xoJ9D7UZP"

    Returns: "aacdffgghijjjkkkkkkmmmnooopqrsttuuuwwxxxz"

  50. "S"

    Returns: "s"

  51. " a"

    Returns: "a"

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