import std.algorithm, std.array, std.container, std.range;
import std.string, std.conv;
import std.math, std.bigint, std.bitmanip, std.random;
import std.stdio, std.typecons;

void main()
{
  auto s = readln.chomp;

  auto x = 0, y = 0;
  foreach (c; s) {
    switch (c) {
    case 'N': y -= 1; break;
    case 'E': x += 1; break;
    case 'W': x -= 1; break;
    case 'S': y += 1; break;
    default:
    }
  }

  writefln("%f", sqrt((x ^^ 2 + y ^^ 2).to!real));
}