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Check for balanced parentheses, brackets, and braces

Question:
Write a function called balanced that takes a string s as input. The function should return True if the string contains only balanced parentheses, brackets, and braces (i.e., (), [], {}), otherwise it should return False.

Example:
Input: balanced("({[]})")
Output: True

def balanced(s):
    """
    Checks if the string contains only balanced parentheses, brackets, and braces.

    Args:
    s: The input string.

    Returns:
    bool: True if the string is balanced, False otherwise.
    """
    # TODO: Implement the balanced function
    pass