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

int main(int argc, char *argv[])
{

	char S[128] = "";

	scanf("%s", S);

	int E = 0;
	int N = 0;

	for (int i = 0; S[i] != 0; i++)
	{
		switch(S[i]){
			case 'N':
				N++;
				break;
			case 'E':
				E++;
				break;
			case 'S':
				N--;
				break;
			case 'W':
				E--;
				break;

			default:
				break;
		
		}
	}

	double X = N*N + E*E;
	X = sqrt(X);

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





	return 0;

}