import std.stdio;
import std.string;
import std.conv;
import std.math;
import std.algorithm;

// main============
void main(){
  real[char] move = ['N':0, 'S':0, 'E':0, 'W':0];
  foreach(c; readln.chomp){move[c] += 1;}
  writeln( ((move['N'] - move['S'])^^2 + (move['E'] - move['W'])^^2)^^0.5 );
}