#include <cstdio>
#include <cmath>
#include <string>
#include <iostream>

using namespace std;

int main(){
  int n = 0, e = 0;
  string str;
  cin >> str;
  for(int i = 0; i < str.size(); i++){
    switch(str[i]){
    case 'N':
      n++;
      break;
    case 'E':
      e++;
      break;
    case 'W':
      e--;
      break;
    case 'S':
      n--;
      break;
    }
  }
  printf("%f\n", sqrt(n * n + e * e));
  return 0;
}