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

int main(void){
    int E = 0, N = 0, W = 0, S = 0, i,a,b,c,d;
    char S1[101];
    
    scanf("%s", S1);
    for (i = 0; S1[i] != 0; i++) {
    	if (S1[i] == 'E') {
    		E++;
    	}
    	else if (S1[i] == 'N') {
    		N++;
    	}
    	else if (S1[i] == 'W') {
    		W++;
    	}
    	else if (S1[i] == 'S') {
    		S++;
    	}
    }
    printf("%lf", sqrt((double)((N - S)*(N - S) + (W - E)*(W - E))));
}