In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: When women reportedly quit drinking early in their pregnancies , fetal growth measures were not significantly different from a non - alcohol - exposed group , regardless of prior drinking patterns .
### Output Text:
When women reportedly quit drinking early in their pregnancies , fetal growth measures were not significantly different from a non - <span class="chemical">alcohol</span> - exposed group , regardless of prior drinking patterns . 