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import java.time.DayOfWeek;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String line = null;
        ArrayList<YM> data = new ArrayList<YM>();
        while (!"".equals(line = s.nextLine())) {
            String [] str = line.split("-");
            YM ym = new YM((Integer.valueOf(str[0]).intValue()), Integer.valueOf(str[1]).intValue());
            data.add(ym);
        }
        for (YM ym : data) {
            printFall(ym);
        }
    }
    
  
 
    private static void printFall(YM ym) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, ym.getYear());
        cal.set(Calendar.MONTH, ym.getMonth());
        cal.set(Calendar.DAY_OF_MONTH, 28);
        System.out.println(DayOfWeek.of(cal.get(Calendar.DAY_OF_WEEK)-1));
    }
    
 
    static class YM {
 
        private int year;
        private int month;
 
        public YM(int year, int month) {
            this.year = year;
            this.month = month;
        }
 
        public int getYear() {
            return year;
        }
 
        public void setYear(int year) {
            this.year = year;
        }
 
        public int getMonth() {
            return month;
        }
 
        public void setMonth(int month) {
            this.month = month;
        }
    }
}

Below are the error details
 
Main.java:2: package java.time does not exist
import java.time.DayOfWeek;
^
Main.java:30: cannot find symbol
symbol : variable DayOfWeek
location: class Main
System.out.println(DayOfWeek.of(cal.get(Calendar.DAY_OF_WEEK)-1));
^
2 errors
Below is your code posted, with line numbers:
1.  
2.  import java.time.DayOfWeek;
3.  import java.util.ArrayList;
4.  import java.util.Calendar;
5.  import java.util.Scanner;
6.  
7.  public class Main {
8.  
9.   public static void main(String[] args) {
10.  Scanner s = new Scanner(System.in);
11.  String line = null;
12.  ArrayList data = new ArrayList();
13.  while (!"".equals(line = s.nextLine())) {
14.  String [] str = line.split("-");
15.  YM ym = new YM((Integer.valueOf(str[0]).intValue()), Integer.valueOf(str[1]).intValue());
16.  data.add(ym);
17.  }
18.  for (YM ym : data) {
19.  printFall(ym);
20.  }
21.  }
22. 
23.  enum DAYS {MONDAY, TUSDAU, }
24. 
25.  private static void printFall(YM ym) {
26.  Calendar cal = Calendar.getInstance();
27.  cal.set(Calendar.YEAR, ym.getYear());
28.  cal.set(Calendar.MONTH, ym.getMonth());
29.  cal.set(Calendar.DAY_OF_MONTH, 28);
30.  System.out.println(DayOfWeek.of(cal.get(Calendar.DAY_OF_WEEK)-1));
31.  }
32. 
33. 
34.  static class YM {
35. 
36.  private int year;
37.  private int month;
38. 
39.  public YM(int year, int month) {
40.  this.year = year;
41.  this.month = month;
42.  }
43. 
44.  public int getYear() {
45.  return year;
46.  }
47. 
48.  public void setYear(int year) {
49.  this.year = year;
50.  }
51. 
52.  public int getMonth() {
53.  return month;
54.  }
55. 
56.  public void setMonth(int month) {
57.  this.month = month;
58.  }
59.  }
60. }
61.

import java.util.Calendar;
import java.util.Locale;
import java.util.Scanner;
 
public class Main {
 
    public static void f(String h) {
        String[] ss = h.split("-");
        int y = Integer.parseInt(ss[0]);
        int m = Integer.parseInt(ss[1]);
        Calendar c = Calendar.getInstance();
        c.set(y, m, 28);
        System.out.println(c.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.ENGLISH).toUpperCase());
    }
 
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String h1 = s.nextLine();
        String h2 = s.nextLine();
        f(h1);
        f(h2);
    }
}