#include <iostream>
#include <string>
#include <cmath>
using namespace std;

int main()
{
    string str;
    cin >> str;

    int n = 0,e = 0,w = 0,s = 0;
    for(int i = 0; i < str.length(); i++){
        if(str[i] == 'N') n++;
        else if(str[i] == 'E') e++;
        else if(str[i] == 'W') w++;
        else s++;
    }
    
    cout << sqrt(pow(abs(n-s),2)+pow(abs(e-w),2)) << endl;

    return 0;
}