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: Wrong Answer)

#include <bits/stdc++.h>
#define MAX_N 100
#define MAX_M 100
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)

using namespace std;

int N;
char S[1000];

int main() {
    cin >> N;
    cin >> S;
    int len = strlen(S);
    for(int i=0; i<len; i++) {
        int x = S[i] - 'A';
        x = (x + N)%26;
        putchar('A' + x);
    }
    putchar('\n');
  	return 0;
}