When designing a workflow, if you manually type a string with single quotes into an input parameter, Workflow Automation strips the single quotes from the string. For example, if you type ',' in the Echo activity, the output is the comma without the single quotes.
To ensure Workflow Automation does not strip the single quotes from the string, do one of the following:
Escape the single quote with another single quote. For example, '',''.
Use the Free-Form Text option in the Input Builder to type the string.