From the passage provided, extract when Susanna started as a principal.
Susanna Gossweiler (1740–1793), was a Swiss educator. She was appointed the first principal of the girls' school Töchterschule in Zürich in 1774, and regarded a pioneer of women's education in Switzerland.
Susanna started as a principal of Töchterschule in 1774.
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(Optional) Context information is below.
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Susanna Gossweiler (1740–1793), was a Swiss educator. She was appointed the first principal of the girls' school Töchterschule in Zürich in 1774, and regarded a pioneer of women's education in Switzerland.
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Answer the following query.
From the passage provided, extract when Susanna started as a principal.

user
Susanna started as a principal of Töchterschule in 1774.
assistant