//{{{
#include <bits/stdc++.h>
using namespace std;
#define rep(...) repN((__VA_ARGS__,rep3,rep2,loop,~))(__VA_ARGS__)
#define loop(n) rep2(_loop_,n)
#define rep2(i,n) rep3(i,0,n)
#define rep3(i,begin,end) for(int i=(int)(begin),i##_end=(int)(end);i<i##_end;++i)
#define repN(a) repX a
#define repX(a0,a1,a2,x,...) x
typedef long long ll;
const int MOD = 1e9+7;
//}}}

int main(){
	string s;
	cin >> s;
	int x = 0;
	int y = 0;
	rep(i, s.size()){
		switch(s[i]){
			case 'N': y--; break;
			case 'E': x++; break;
			case 'W': x--; break;
			case 'S': y++; break;
		}
	}
	
	printf("%.6f\n", sqrt(x * x + y * y));
	return 0;
}