#include<stdio.h>
#include<math.h>
int main(void)
{
  int south_and_north = 0;
  int east_and_west   = 0;
  char c[101];
  int i;
  scanf("%s",c);
  for(i=0;c[i]!='\0';i++){
    switch(c[i]){
    case 'N':south_and_north++;break;
    case 'S':south_and_north--;break;
    case 'E':east_and_west++;break;
    case 'W':east_and_west--;break;
    }
  }
  printf("%f\n",sqrt(south_and_north*south_and_north+east_and_west*east_and_wes\
t));
  return 0;
}