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(void){
    int n,i;
    char str[2][1000];
    
    scanf("%d",&n);
    scanf("%s",str[0]);
    
    i=0;
    while (1) {
        str[0][i] += n;
        
        if (str[0][i] > 'Z') {
            str[0][i] = (str[0][i] - 'Z') + 64;
        }
        
        i++;
        
        if (str[0][i] == '\0') break;
    }
    
    for (i=0;str[0][i] != '\0';i++){
        printf("%c",str[0][i]);
    }
    
    return 0;
}