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 JavaScript (node.js v5.12) (judge verdict: Runtime Error)

function Main(input) {
  const inputs = input.split('\n')
    .filter(v => v);
  const n = Number(inputs[0]);
  const strs = inputs[1]
    .split('');
  
  console.log(strs.map(function(s) {
    var c = s.charCodeAt() + n;
    if (c > 90) {
      c -= 26;
    }
    return String.fromCharCode(c)
  }).join(''));
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));