import Foundation
let S = Array(readLine()!)
var (x,y) = (0,0)
for i in S{
    if i == "E"{x += 1}
    else if i == "W"{x -= 1}
    else if i == "N"{y += 1}
    else if i == "S"{y -= 1}
}
(x,y) = (abs(x),abs(y))
print(Double(x*x + y*y).squareRoot())