# Problem Description
This is a string validation problem where we need to determine if a given input string meets certain criteria shown in the image examples. We need to implement a function that takes a string input and returns a boolean value indicating whether the string is valid according to the observed patterns.

# Visual Facts
1. The image shows 7 test cases with their expected results
2. Test cases with TRUE results:
   - "aba" 
   - "1221"
   - "masdgfsgdgsfgdsam"
   - "19madam91"
3. Test cases with FALSE results:
   - "openai"
   - "masdgfsgdgsfgdSam"
   - "19madaM91"
4. Each test case shows the input string in quotes followed by an arrow and either TRUE or FALSE in green or red respectively

# Visual Patterns
1. Palindrome Pattern:
   - All TRUE cases are palindromes (read the same forwards and backwards)
   - "aba" reads the same both ways
   - "1221" reads the same both ways
   - "19madam91" reads the same both ways

2. Case Sensitivity:
   - The function is case-sensitive
   - "masdgfsgdgsfgdsam" is valid but "masdgfsgdgsfgdSam" is not (only difference is uppercase 'S')
   - "19madam91" is valid but "19madaM91" is not (only difference is uppercase 'M')

3. Character Types:
   - The function accepts both letters and numbers in the input
   - The validation works for:
     - Pure alphabetical strings (e.g., "aba")
     - Pure numerical strings (e.g., "1221")
     - Mixed alphanumeric strings (e.g., "19madam91")

4. Length:
   - Valid strings can be of varying lengths (from 3 characters to longer strings)
   - Both odd and even length strings can be valid


# Solution
def solution(str1: str) -> bool:
    """
    Determines if the given string is valid according to the image criteria.

    Parameters:
        str1 (str): The input string to validate.

    Returns:
        bool: True if the string is valid, False otherwise.
    """
    if str1 == str1[::-1]:
        return True
    return False


# Test Script

def test():
    test_cases = [
        ("aba", True),
        ("1221", True),
        ("openai", False),
        ("masdgfsgdgsfgdsam", True),
        ("masdgfsgdgsfgdSam", False),
        ("masdgfsgfgdsam", False),
        ("madam", True),
        ("Hello", False),
        ("HellolleH", True),
        ("Hellolleh", False)
    ]

    for str1, expected_output in test_cases:
        try:
            output = solution(str1)
        except Exception as e:
            error_message = (
                f"An exception occurred while running the test case:\n"
                f"`str1`: {str1}\n\n"
                f"Exception: '{str(e)}'"
            )
            assert False, error_message

        if output != expected_output:
            error_message = (
                f"The following Test Case failed:\n"
                f"`str1`: {str1}\n\n"
                f"Actual Output: {output}\n"
                f"Expected Output: {expected_output}"
            )
            assert False, error_message

test()