I think you mean OpenOffice Calc (spreadsheet program)
I think that in any spreadsheet SW, mixed letters and numbers will be interpreted as text. Some quick tests with Calc shows these non-numeric characters that are treated "numerically": "+", "-", ".", "$", "%". Are there more???
Interestingly:
65- is converted to -65
+78 OR 78+ both come out as just 78
BUT:
65+23 is read as text
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