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()
{
    char *week[]={"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
    char *weekf[]={"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
    char *weekn[]={"","tomorrow", "two", "three", "four", "five", "six","seven"};
    char d[3]="";
    int i=0;
    scanf(" %s",&d);
    for(i=0;i<7;i++){
        if(strcmp(week[i],d)==0){
            break;
        }
    }
    if(i==0){
        printf("It is Sunday today, and seven days later, it will be Sunday again.");
    }else if(i==6){
        printf("It is Saturday today, and tomorrow will be Sunday.");
    }else{
        printf("It is %s today, and %s days later, it will be Sunday again.",weekf[i],weekn[7-i]);
    }
}