#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int a[2];
int main(){
    string s;cin>>s;
    cout << fixed << setprecision(10);
    for(int i = 0; s.size() > i; i++){
        if(s[i] == 'N')a[0]++;
        else if(s[i] == 'S')a[0]--;
        else if(s[i] == 'E')a[1]++;
        else a[1]--;
    }
    cout << (double)sqrt((a[0]*a[0])+(a[1]*a[1])) << endl;
}