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

int main(void)
{
    char    S[128];
    int     i, x, y;

    memset(S, '\0', sizeof(S));
    scanf("%s", S);

    x = y = 0;
    for (i = 0; (S[i] != '\0') && (S[i] != '\n'); i++) {
        switch (S[i]) {
            case 'N': y++; break;
            case 'S': y--; break;
            case 'E': x++; break;
            case 'W': x--; break;
            default : break;
        }
    }

    printf("%lf\n", sqrt((double)(x * x + y * y)));

    return 0;
}