
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Define a sequence by  $a_0=2019$  and  $a_n=a_{n-1}^{2019}$  for all positive integers  $n$ . Compute the remainder when \[a_0+a_1+a_2+\dots+a_{51}\] is divided by  $856$ .

*Proposed by Tristan Shin*

Present the answer in LaTex format: \boxed{Your answer}
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