#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <cstring>

typedef long long ll;
using namespace std;

#define mod 1000000009
#define INF 10000000
#define LLINF 2000000000000000000LL

#define SIZE 101


int main(){
    string S;
    int x=0,y=0;
    
    cin >> S;
    
    for(int i=0;i<S.size();i++)
    {
        switch (S[i]) {
            case 'N':
                y++;
                break;
            case 'W':
                x++;
                break;
            case 'S':
                y--;
                break;
            case 'E':
                x--;
        }
    }
    
    printf("%.5lf\n",sqrt((double)(x*x+y*y)));
    return 0;
}