<|im_start|>user
From the passage provided, extract when Susanna started as a principal.

Context:
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.<|im_end|>
<|im_start|>assistant
Susanna started as a principal of Töchterschule in 1774.<|im_end|>
