def dayOfProgrammer(year):

    # During Transition 13 days skipped
    if year == 1918:
        return "26.09.1918"
    
    # Julian calendar
    if year < 1918:
        leap = (year % 4 == 0)
        
    # Gregorian calendar
    elif year > 1918:
        leap = (year % 400 == 0) or ((year % 4 == 0) and (year % 100 != 0))
    if leap:
        return f"12.09.{year}"
    else:
        return f"13.09.{year}"