class Employee:

    def __init__(self, first, last, pay):
        self.first = first
        self.last = last
        self.email = first + '.' + last + '@email.com'
        self.pay = pay

    def fullname(self):
        return '{} {}'.format(self.first, self.last)

    def __str__(self):
        return '{} - {}'.format(self.fullname(), self.email)

    def __add__(self, other):
        return self.pay + other.pay

    def __len__(self):
        return len(self.fullname())

emp_1 = Employee('Masoud', 'Sadrnezhaad', 5000)
emp_2 = Employee('Mostafa', 'Amiri', 1000)

print(len(emp_1))
print(emp_1 + emp_2)
print(emp_1)