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 Go (1.6) (judge verdict: Wrong Answer)

 package main

import(
    "fmt"
)

func keta(n int) int {
    count := 0
    for {
        count++
        n = n/10
        if n < 10 {
            return count + 1
        }
    }
}

var A, B, X int


func calc(num int) bool {
    if X < A* num + B * keta(num) {
        return false
    }
    return true
}

func main() {
    var result int
    fmt.Scan(&A, &B, &X)
    store := 1
    start := 1

    for i:=start;i < X;i++ {
        if i % 10 == 0 {
            store = keta(i)
        }
        if X < A * i + B * store {
            result = i - 1
            break
        }
    }
    fmt.Println(result)
}