
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
A school organized some Young Pioneers to watch a cultural performance. The teacher sent the team leader to buy tickets first. It is known that each first-class ticket costs 10 yuan, each second-class ticket costs 8 yuan, the team leader took 450 yuan to buy 45 tickets, and got 50 yuan in change. Therefore, the team leader bought $\boxed{\text{first-class tickets}}$.

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