Given below is a set of four sentences, and when properly sequenced, form a coherent paragraph. Arrange the sentences in the correct sequence:

a. After trying several options, he finally decided to use a typewriter.

b. He was a poet looking for the right medium to express his thoughts.

c. But he found the typewriter, with its mechanical sound and rhythm, to be an aid rather than a hindrance to his creative process.

d. Many people were surprised at his workaround.