Input (grade 13): It is the brother school of the City of London School for Girls (a girls' school within the City) and the co-educational City of London Freemen's School (a day and boarding school in Surrey).
Output (grade 12): It is the brother school of the City of London School for Girls (a girls' school within the City) and of the City of London Freemen's School (a day and boarding school in Surrey).