Press the instructed key.

Act as fast and accurately as possible.

The instruction is to press J, you press <<J>> in 2178 ms. That is correct.
The instruction is to press J, you press <<J>> in 627 ms. That is correct.
The instruction is to press D, you press <<D>> in 946 ms. That is correct.
The instruction is to press D, you press <<D>> in 474 ms. That is correct.
The instruction is to press F, you press <<F>> in 640 ms. That is correct.
The instruction is to press K, you press 