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

int main(int ac, char *av[])
{
    int c, v = 0, h = 0;

    while (1) {
        c = getchar();
        switch (c) {
        case 'E': h++; break;
        case 'W': h--; break;
        case 'N': v++; break;
        case 'S': v--; break;
        default: /* end of string; do the actual processing here */
            printf("%f\n", sqrt(h*h + v*v));
            exit(0);
        }
    }
    return 0;
}