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

int main(void)
{
    int n=0,e=0,w=0,s=0;
    char direction[120]="";
    scanf("%s",direction);
    for(int i=0;i<strlen(direction);i++)
    {
        if(direction[i]=='N')
        {
            n++;
        }
        if(direction[i]=='E')
        {
            e++;
        }
        if(direction[i]=='W')
        {
            w++;
        }
        if(direction[i]=='S')
        {
            s++;
        }
    }
    double ans = sqrt(n+e+w+s);
    printf("%.5lf",ans);
}