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

int main(void){
  int i, x, y;
  char S[100];
  scanf("%s", S);
  x = y = 0;
  for(i = 0; S[i] != '\0'; i++){
    if(S[i] == 'N') y++;
    if(S[i] == 'E') x++;
    if(S[i] == 'W') x--;
    if(S[i] == 'S') y--;
  }
  printf("%lf\n", sqrt(x * x + y * y));
  return 0;
}