#include <iostream>
#include <string>
#include <cmath>
using namespace std;
int main()
{
    int x[128]={}, y[128]={};
    y['N']=1, y['S']=-1;
    x['W']=1, x['E']=-1;
    string s;
    cin>>s;
    int a=0, b=0;
    for(char c: s) { a+=x[c]; b+=y[c]; }
    cout<<hypot(a, b)<<endl;
}