#include<cstdio>
#include<cstring>
#include<cmath>
#define rep(i,a) for(int i=0;i<(a);++i)

char S[101];

int main()
{
	scanf( "%s", S );
	
	int x = 0, y = 0;
	rep( i, strlen(S) )
	{
		if( S[i] == 'N' )
			++y;
		else if( S[i] == 'E' )
			++x;
		else if( S[i] == 'W' )
			--x;
		else if( S[i] == 'S' )
			--y;
	}

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

	return 0;
}