use std::io::*;
use std::str::FromStr;

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn get_word<T: FromStr>() -> T {
    (&get_line()).parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(|x| x.parse().ok().expect("parse error.")).collect()
}

fn main() {
    let mut x: i64 = 0;
    let mut y: i64 = 0;

    let s = get_line();
    for c in s.chars() {
        match c {
            'N' => y += 1,
            'E' => x += 1,
            'W' => x -= 1,
            'S' => y -= 1,
            _ => (),
        };
    }

    println!("{:.10}",
        ((x.pow(2) + y.pow(2)) as f64).sqrt());
}