#include <bits/stdc++.h>
using namespace std;

//--------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define LL long long
#define INF INT_MAX/3

//--------------------------------------------
const double EPS = 1e-14;
const double PI  = acos(-1.0);

//--------------------------------------------

int main(){
  double x = 0;
  double y = 0;
  char s[110];
  scanf("%s",s);
  REP (i,110) {
    if (s[i] == 'N') y = y + 1;
    else if (s[i] == 'S') y = y - 1;
    else if (s[i] == 'E') x = x + 1;
    else if (s[i] == 'W') x = x - 1;
  }

  printf("%lf\n",sqrt((x * x) + (y * y)));
}