Problem:
Score : 100 points

Problem Statement

Given is a string S representing the day of the week today.

S is SUN, MON, TUE, WED, THU, FRI, or SAT, for Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday, respectively.

After how many days is the next Sunday (tomorrow or later)?

Constraints

S is SUN, MON, TUE, WED, THU, FRI, or SAT.

Input

Input is given from Standard Input in the following format:

S

Output

Print the number of days before the next Sunday.

Sample Input 1

SAT

Sample Output 1

1

It is Saturday today, and tomorrow will be Sunday.

Sample Input 2

SUN

Sample Output 2

7

It is Sunday today, and seven days later, it will be Sunday again.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.*;
 
public class Main
{
    static BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    static int tc=1;
    static String[] s;
 
    public static long[] ila(String[] s){
        long[] array=new long[s.length];
        for(int i=0;i<array.length;i++)
            array[i]=Long.parseLong(s[i]);
        return array;
    }
    public static void main (String[] args) throws java.lang.Exception
    {
        //tc=Integer.parseInt(br.readLine());
        t:
        while(tc-->0){
		  String[] days={"SUN","MON","TUE","WED","THU","FRI","SAT"};
		  ArrayList<String> al=new ArrayList<>();
		  for(int i=0;i<days.length;i++){
		  	al.add(days[i]);
		  }
		  String str=br.readLine();
		  int x=al.indexOf(str);
		  int ans=7-x;
		  //if(ans==0)
			//System.out.println(7);
		  //else
			System.out.println(ans);
        }
    }
}