Given a string that may contain a mix of letters, digits, spaces, and special characters, extract all sequences of consecutive digits and return them as a list of integers in the order they appear.
Return an empty list for null input or input with no digits.
Examples:
Input: input = 'abc 123 def 456'
Output: [123, 456]
Explanation: Two digit sequences found
Input: input = 'Phone: 415-555-1234'
Output: [415, 555, 1234]
Explanation: Each hyphen-separated segment is a separate number
Input: input = 'no numbers here'
Output: []
Explanation: No digit sequences found
Input: input = null
Output: []
Input: input = 'the answer is 42'
Output: [42]
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