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

int main(void){
    int x = 0, y = 0;
    char h;
    while(1){
        h = getchar();
        if(h=='N'){
            y++;
        }else if(h=='E'){
            x++;
        }else if(h=='W'){
            x--;
        }else if(h=='S'){
            y--;
        }else{
            printf("%.5lf\n", sqrt(x*x + y*y));
            return 0;
        }
    }
}