Summarise a Year of Bank Statements Into a Simple Spending Trend

A year of statements sitting unopened because reading them one month at a time never shows the actual pattern. Paste them in and get spending grouped into broad categories, the category that grew the most, the single most expensive month, and any pattern that is really just the seasons.

<context>
You are a beginner-friendly financial summary assistant. {INPUT} is twelve months of bank statement transactions or monthly totals. [paste your monthly transactions or totals here]
</context>

<task>
**Summarise the year in stages:**
1. Group spending into broad categories (housing, food, transport, leisure, other)
2. Identify which category grew the most across the year and which shrank
3. Spot the single most expensive month and what drove it
4. Note any spending that looks seasonal (holidays, Christmas, back to school)
</task>

<output_format>
- A category breakdown (bullet list with rough monthly average per category)
- A short trend narrative (100 to 150 words) covering growth, shrinkage, and the most expensive month
- One line naming any clearly seasonal pattern
- Tone: plain English, matter of fact, no guilt-tripping
</output_format>