clarification in Forgot Password

‘decimal number’ does it mean that S evaluates to be like “-034920.20390942” or “+03948.234829300” after the replacements?

don’t worry about -,+. I don’t think there are cases with - or +.

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can answer be empty string???

no, bcz clearly mentioned that answer is guaranteed to be a decimal number

Decimal number means that the number can be represented in Base 10. The decimal point may or may not be there.

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