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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def check(cls):
 """Test to see if the running host is a RHEL installation. Checks for the presence of the "Red Hat Enterprise Linux" release string at the beginning of the NAME field in the `/etc/os-release` file and returns ``True`` if it is found, and ``False`` otherwise. :returns: ``True`` if the host is running RHEL or ``False`` otherwise. """

        if not os.path.exists(OS_RELEASE):
            return False

        with open(OS_RELEASE, "r") as f:
            for line in f:
                if line.startswith("NAME"):
                    (name, value) = line.split("=")
                    value = value.strip("\"'")
                    if value.startswith(cls.distro):
                        return True
        return False