Determine if a word or phrase is an isogram.

An isogram (also known as a "non-pattern word") is a word or phrase without a repeating letter, however spaces and hyphens are allowed to appear multiple times.

Examples of isograms:

  • lumberjacks
  • background
  • downstream
  • six-year-old

The word isograms, however, is not an isogram, because the s repeats.


Register Usage Type Description
$a0 input address null-terminated input string
$v0 output boolean input is an isogram (0 = false, 1 = true)
$t0-9 temporary any used for temporary storage


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