#include<iostream>
#include<string>
#include<math.h>
using namespace std;

int main()
{
    string s;
    cin >> s;
    double height=0.0, width=0.0;
    for(int i=0; i<s.length(); i++) {
        if(s[i] == 'N') { height+=1.0; }
        else if(s[i] == 'S') { height-=1.0; }
        else if(s[i] == 'W') { width-=1.0; }
        else if(s[i] == 'E') { width+=1.0; }
    }
    double result = sqrt(height*height + width*width);
    cout << result << endl;
    return 0;
}