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

int main()
{
  string s;
  cin >> s;
  int l = s.length();
  float x=0, y=0;
  for(int i=0; i<l; i++){
    switch(s[i]){
    case 'N': y++; break;
    case 'E': x++; break;
    case 'W': x--; break;
    case 'S': y--; break;
    }
  }
  float d = sqrt(x*x+y*y);
  printf("%.8f\n", d);
  return 0;
}