
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
Numbers from 1 to 50 are written on a board. It is allowed to erase any two numbers and write one number as the absolute value of their difference. After repeating the procedure 49 times, one number will remain on the board. What could this number be?

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