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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define endl '\n'
#define fcin ios::sync_with_stdio(false); cin.tie(nullptr);
#define INF 0x3f3f3f3f
#define all(x) x.begin(), x.end()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

typedef long long ll;
typedef pair<int, int> pii;

template <typename A, typename B>
string to_string(pair<A, B> p){
    return "(" + to_string(p.fi) + ", " + to_string(p.se) + ")";
}

template <typename T>
string to_string(T v){
    string s = "{";
    bool first = true;
    for(const auto & x : v){
        if(!first) s += ", ";
        first = false;
        s += to_string(x);
    }
    return s + "}";
}

void debug_out(){ cerr << endl;}
template <typename First, typename... Next>
void debug_out(First F, Next... N){
    cerr << " " << to_string(F);
    debug_out(N...);
}

#ifdef LOCAL
    #define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
    #define debug(...) 1
#endif

int main(){
    fcin;
    vector<string> v = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};

    string s;
    cin >> s;

    int i;
    int n = v.size();
    for(i = 0; i < n; i++) if(v[i] == s) break;
    
    int ans = 0;
    while(true){
        i++;
        ans++;
        i %= 7;
        if(v[i] == s) break;
    }
    cout << ans << endl;
    return 0;
}