function error

import java.util.Scanner;
class Scratch {
    static void wrong(boolean wrongCentury, boolean wrongDay, boolean wrongMonth, boolean wrongYear, boolean wrongLetter)
    {
        System.out.println(wrongCentury);
        if(wrongYear = true)
        {
            System.out.println("wrong Century");
        }
        if(wrongMonth = true)
        {
            System.out.println("wrong Month");
        }
        if(wrongDay = true)
        {
            System.out.println("wrong Day");
        }
        if(wrongCentury = true)
        {
            System.out.println("wrong Century");
        }
        if(wrongLetter = true)
        {
            System.out.println("erroe: you enter letter");
        }
        return;
    }

    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        String IIN = in.nextLine();
        System.out.println(IIN);
        String year = IIN.substring(0, 2);
        String month = IIN.substring(2, 4);
        String day = IIN.substring(4, 6);
        String century = IIN.substring(6, 7);
        int Year = Integer.parseInt(year);
        int Month = Integer.parseInt(month);
        int Day = Integer.parseInt(day);
        int Century = Integer.parseInt(century);
        boolean wrongYear = false;
        boolean wrongMonth = false;
        boolean wrongDay = false;
        boolean wrongCentury = false;
        boolean wrongLetter = false;
        for(int i=0; i<IIN.length(); i++)
        {
            if(IIN.charAt(i)<'0' || IIN.charAt(i)>'9')
            {
                wrongLetter = true;
            }
        }
        if(Month>12 || Month<=0)
        {
            wrongMonth = true;
        }
        if(Century>6 || Century<=0)
        {
            wrongCentury = true;
        }
        if(Year<=0)
        {
            wrongYear = true;
        }
        int leapYear = Year%4;
        String monthout = "";
        switch(Month)
        {
            case 1:
            {
                monthout = "january";
                break;
            }
            case 2:
            {
                if(leapYear==0)
                {
                    if(Day>29)
                    {
                        wrongDay = true;
                    }
                    else
                    {
                        monthout ="febuary";
                        break;
                    }
                }
                else
                {
                    if(Day>28)
                    {
                        wrongDay = true;
                    }
                    else
                    {
                        monthout = "febuary";
                        break;
                    }
                }
            }
            case 3:
            {
                monthout = "march";
                break;
            }
            case 4:
            {
                monthout = "april";
                break;
            }
            case 5:
            {
                monthout = "may";
                break;
            }
            case 6:
            {
                monthout = "june";
                break;
            }
            case 7:
            {
                monthout = "jule";
                break;
            }
            case 8:
            {
                monthout = "august";
                break;
            }
            case 9:
            {
                monthout = "september";
                break;
            }
            case 10:
            {
                monthout = "october";
                break;
            }
            case 11:
            {
                monthout = "november";
                break;
            }
            case 12:
            {
                monthout = "december";
                break;
            }
        }
        String sex = "";
        switch(Century)
        {
            case 1:
            {
                Year = Year+1800;
                sex += "man";
                break;
            }
            case 3:
            {
                Year = Year+1900;
                sex += "man";
                break;
            }
            case 5:
            {
                Year = Year+2000;
                sex += "man";
                break;
            }
            case 2:
            {
                Year = Year+1800;
                sex += "woman";
                break;
            }
            case 4:
            {
                Year = Year+1900;
                sex += "woman";
                break;
            }
            case 6:
            {
                Year = Year+2000;
                sex += "woman";
                break;
            }
        }
        wrong(wrongCentury, wrongDay, wrongMonth, wrongYear, wrongLetter);
        System.out.println("test answer");
        int Age = 2019 - Year;
        int today = 18;
        int currentMonth = 4;
        if(Month>=currentMonth && Day>today || Month>currentMonth)
        {
            Age = Age-1;
        }
        System.out.println(Year+" "+Month+" "+Day+" "+Century);
        System.out.println("Age: "+Age);
        System.out.println("Date of birthday: "+Day+" "+monthout+" "+Year);
        System.out.println(sex);
    }

}