#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

int main()
{
  string s;
  cin >> s;
  int x = 0, y = 0;
  FOR(i,0,s.length()) {
    if(s[i]=='N') y++;
    if(s[i]=='E') x++;
    if(s[i]=='W') x--;
    if(s[i]=='S') y--;
  }
  printf("%.05lf\n",sqrt(x*x+y*y));
  return 0;
}