You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did cristiano ronaldo started playing for portugal?" whose answer is August 2003.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Cristiano Ronaldo first international appearance for Portugal
Useful Output:

Doc 1: Cristiano Ronaldo holds the world record for international goals, scoring 136 for Portugal since making his debut in 2003.
Doc 2: Ronaldo, a five-time Ballon d'Or winner, made his Portugal debut in 2003 at the age of 18. He won a European Championship in 2016 and the UEFA
Doc 3: He made his senior international debut in June 2007, playing the full 90 minutes of a UEFA EURO 2008 qualifier against Portugal. Vertonghen
Doc 4: 19 years ago today, Cristiano Ronaldo scored his first goal for Portugal against Greece at the Euro 2004. 198 caps (most) ⚽️ 122
Doc 5: Debuts ; International Friendlies · Portugal U15, Feb 24, 2001, Portugal U15 2:1 · South Africa U15 ; EURO 2004 · Portugal, Jun 12, 2004, Portugal