def julian_year(year):
    if year % 4 == 0:
        return f"12.09.{year}"
    else:
        return f"13.09.{year}"

def transition_year():
    return "26.09.1918"

def gregorian_year(year):
    if year % 400 == 0:
        return f"12.09.{year}"
    elif year % 100 == 0: 
        return f"13.09.{year}"
    elif year % 4 == 0: 
        return f"12.09.{year}"
    else:
        return f"13.09.{year}"


def dayOfProgrammer(year):
    
    if 1700 <= year <= 1917:
        return julian_year(year)
    elif year == 1918:
        return transition_year()
    elif 1919 <= year <= 2700:
        return gregorian_year(year)