/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.time.* ;
import java.time.format.* ;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String input = "220400" ;
 
        DateTimeFormatter f = DateTimeFormatter.ofPattern( "uuMM'00'" ) ;
        YearMonth ym = YearMonth.parse( input , f ) ;
        LocalDate ld = ym.minusMonths( 1 ).atEndOfMonth() ;
        System.out.println( ld ) ;
	}
}

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