#include <stdio.h>
#include <math.h>

int main() {
  char s[101];
  scanf("%s",s);
  double a=0,b=0;
  int i=0;
  while(s[i]>='A' && s[i]<='Z') {
    if(s[i]=='S') a++;
    if(s[i]=='N') a--;
    if(s[i]=='E') b++;
    if(s[i]=='W') b--;
    i++;
  }
  printf("%.10f\n",sqrt(a*a+b*b));
  return 0;
}