迷路的牛牛

#include <iostream>
#include <vector>
#include <cstring>

using namespace std;

int main(){
    int N;
    cin >> N;
    vector<char> data;
    for(int i = 0 ; i < N; i++){
        char tmp_N;
        cin >> tmp_N;
        data.push_back(tmp_N);
    }
    int begin = 0;
    for(int i = 0; i < data.size(); i++){
        if(data[i] == 'L')
            begin --;
        if(data[i] == 'R')
            begin ++;
    }
    bool flag = false;
    if(begin < 0) flag = true;
    begin = abs(begin) % 4 ;
    char fx;
    switch(begin){
        case 0: cout << "N" << endl; break;
        case 1: fx = flag ? 'W' : 'E'; cout << fx << endl; break;
        case 2: cout << "S" << endl; break;
        case 3: fx = flag ? 'E' : 'W'; cout << fx << endl; break;
        default: cout << "NULL" << endl;
    }
    return 0;
}