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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
#define VI vector<int>
#define pb push_back
#define LL long long
#define mp make_pair
#define pii pair<int,int>
using namespace std;
string days[] = { "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
int main(){
	string x;
	cin>>x;
	int d = 0;
	for(int i = 0; i < 8; i++){
		if(days[i] == x){
			d = i;
			break;
		}
	}
	d = (d + 1)%7;
	int dif = 1;
	for(; days[d%7] != "SUN"; d++, dif++);
	printf("%d\n", dif);
	return 0;
}