class Employee:
    def __init__(self, fio="Unknown", otdel="Not specified", 
                 dolzhnost="Not specified", oklad=0):
        self.fio = fio
        self.otdel = otdel
        self.dolzhnost = dolzhnost
        self.oklad = oklad
        self._poosherenia = []

    def increase_oklad(self, amount):
        if amount < 0:
            print(f"Error: amount cannot be negative ({amount})")
            return self.oklad
        else:
            old_oklad = self.oklad
            self.oklad += amount
            print(f"{self.fio}: salary increased by {amount:,} rub. "
                  f"({old_oklad:,} → {self.oklad:,} rub.)")
            return self.oklad

    def change_department(self, new_department):
        old_department = self.otdel
        self.otdel = new_department
        print(f"Employee {self.fio} transferred from {old_department} to {new_department}.")

    def change_position(self, new_position):
        old_position = self.dolzhnost
        self.dolzhnost = new_position
        print(f"Employee {self.fio} position changed from {old_position} to {new_position}.")

    @property
    def poosherenia(self):
        return self._poosherenia.copy()

    def add_poosherenia(self, text):
        """Adds a new commendation"""
        self._poosherenia.append(text)
        print(f"{self.fio}: added commendation: '{text}'")
    
    def show_info(self):
        """Shows employee information"""
        print(f"\n{'='*40}")
        print(f"EMPLOYEE: {self.fio}")  # ← английское имя!
        print(f"Department: {self.otdel}")  # ← английское имя!
        print(f"Position: {self.dolzhnost}")  # ← английское имя!
        print(f"Salary: {self.oklad} rub.")
        if self._poosherenia:
            print("Commendations:")
            for item in self._poosherenia:
                print(f"  • {item}")
        else:
            print("No commendations")
        print(f"{'='*40}")