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

int main()
{
	char S[101];
	int X = 0, Y = 0, len;

	scanf("%s%n", &S, &len);

	for (int i = 0; i < len; i++)
	{
		if (S[i] == 'N')
		{
			Y++;
		}
		else if (S[i] == 'E')
		{
			X++;
		}
		else if (S[i] == 'W')
		{
			X--;
		}
		else if (S[i] == 'S')
		{
			Y--;
		}

	}

	float a = (X * X) + (Y * Y);
	a = sqrt(a);

	printf("%f", a);

	return 0;
}