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

int main(){
    char str[100];
    int len, i;
    int width = 0, height = 0;
    double dist = 0;

    scanf("%s", str);
    len = strlen(str);

    for(i = 0; i < len; i++){
        if(str[i] == 'N'){
            height++;
        }else if(str[i] == 'E'){
            width++;
        }else if(str[i] == 'S'){
            height--;
        }else if(str[i] == 'W'){
            width--;
        }
    }
    dist = sqrt(height*height + width*width);

    printf("%lf\n", dist);

    return 0;

}