import std.stdio, std.math, std.string;

void main(){
    string str = readln.strip;
    auto
    n = str.count('N'),
    s = str.count('S'),
    w = str.count('W'),
    e = str.count('E');
    double tmp = (n-s)^^2;
    tmp += (w-e)^^2;
    auto res = tmp.sqrt;
    writefln("%f", res);
}