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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>

int main(){
        int rot = 0;
        char *s,*ans;
        char c;
        int i = 0;
        s = malloc(10001);
        ans = malloc(10001);
        scanf("%d\n",&rot);
        fgets(s,10001,stdin);
        while(s[i] != '\n'){
                c = s[i] + rot;
                if(c > 'Z'){
                        c -= 26;
                }
                ans[i] = c;
                i++;
        }
        printf("%s\n",ans);
        return 0;
}