def METHOD_NAME(postfix: str) -> str:
    infix = []
    for char in postfix:
        if char.isalpha():  # operand
            infix.insert(0, char)
        else:  # operator
            right_operand = infix.pop(0)
            left_operand = infix.pop(0)
            infix.insert(0, f"({left_operand} {char} {right_operand})")
    return infix.pop()