I saw this poster at the train station in Lille.
I didn’t know that héros was a singular noun (masculine) in French.
Mais maintenant je le sais. I guess the final s is silent.
Je ne suis pas un???
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Moving to France and adapting to life in Lyon
Thrown to (the) Lyon 
And you’ve guessed right !
Feminine : une héroïne ( comme la drogue )
Bon séjour à Londres !
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