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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