#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
#define per(i,n,a) for (int i = n-1;i >= a;i--)
using namespace std;

int main(){
    string S;
    cin >> S;
    int x = 0, y = 0;
    rep(i,0,S.size()){
        switch (S[i]){
            case 'N':
                y++;
                break;
            case 'E':
                x++;
                break;
            case 'W':
                x--;
                break;
            case 'S':
                y--;
                break;

        }
    }
    printf("%.14f\n", hypot(x, y));
}