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<string.h>

int main(){
  char input[4];
  char *list[7] = {"SUN","MON","THU","WED","THU","FRI","SAT"};
  int I=0;
  scanf("%s",input);
  //printf("%s\n",input);
  for(int i= 0;i<7;i++){
    // printf("%s\n",list[i]);
    if(!strcmp(input,list[i])){
      I = i;
      break;
    } 
  }
 
  printf("%d\n",7-I); 
}