#include <stdio.h>
#include <math.h>
int main(){
  int i = 0, x = 0, y = 0;
  char s[101];
  scanf("%s", s);
  while(s[i] != '\0'){
    switch(s[i++]){
    case 'N': y++; break;
    case 'E': x++; break;
    case 'W': x--; break;
    case 'S': y--; break;
    }
  }
  printf("%f\n", sqrt((double)(x * x + y * y)));
  return 0;
}