Parse String

Problem Statement

You are given a string that consists only of digits, letters, and whitespace characters. Your task is to scan the string, identify every maximal contiguous block of digit characters, convert each block into an integer, and return all these integers in the order they appear.

Function Signature

def extract_numbers(s: str) -> list[int]:

Examples

• input

  "abc123def456"

  output

  [123, 456]

  explanation

  The digits "123" form the first number, and "456" the second. All non-digit characters are skipped.

• input

  "a1b2c3"

  output

  [1, 2, 3]

  explanation

  Each digit is isolated by letters, so they become separate integers.

• input

  "12 34 56"

  output

  [12, 34, 56]

  explanation

  Whitespace separates the digit groups but is ignored; each group is parsed as a number.

Constraints

• The length of the input string will not exceed 1000 characters.