/*
	yukicoder 113
	回答者：ヒロソフ
*/


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

int main(void){

	char MoveRoot[101];
	
	int NS = 0, EW = 0;
	
	scanf("%s", MoveRoot);

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

	printf("%.5f\n", sqrt((double) (NS * NS + EW * EW)));

	return 0;
}