This PR fixes a syntax error in the "Input and Output" exercise solution.

The previous solution block contained a malformed print statement,
which caused the exercise to fail with a syntax error when submitted.

This update replaces the broken line with a valid print statement:

print("Hello, my name is {}, I am {} years old, and I am from {}.".format(name, age, country))

Verification steps:

• Ran the LearnPython.org environment locally to confirm the syntax error no longer appears.
• Tested the corrected solution code directly using redirected stdin to simulate user input.
• Confirmed the script executes successfully and produces the expected formatted output.

This resolves the issue reported in #863.