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

int main()
{
  char s[101]={0};
  int x=0,y=0,i;
  double d;

  scanf("%s",s);

  for (i=0;i<101;i++) {
    switch(s[i]) {
    case 'N' :
      y++;
      break;
    case 'E' :
      x++;
      break;
    case 'W' :
      x--;
      break;
    case 'S' :
      y--;
      break;
    }
  }
  d=sqrt(x*x+y*y);
  printf("%f\n",d);
  return 0;
}