#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <cmath>
#include <iomanip>
using namespace std;
typedef long long LL;

int main(){
    string s;
    cin >> s;
    int x = 0;
    int y = 0;
    for(int i = 0; i < s.size(); i++){
        if(s[i] == 'N') y -= 1;
        if(s[i] == 'E') x += 1;
        if(s[i] == 'W') x -= 1;
        if(s[i] == 'S') y += 1;
    }
    cout << setprecision(13) << sqrt(x*x + y*y) << endl;
    return 0;
}