Took less than a minute to find a seven digit example in python
The SHA-256 of this sentence begins with 0, three, 9, four, 8, four, and 1 amazing!
The SHA256 for this sentence begins with 0, 4, five, 5, eight, 6, and 7 amazing!
Suffix extensions (hence the "amazing!") are several times faster to try than throwing away the entire sha256 state for each attempt.