const input = require("fs").readFileSync("/dev/stdin", "utf8");
const chars = input.split('');

const o = {
  N: 0,
  S: 0,
  E: 0,
  W: 0,
};

chars.forEach(c => {
  if (o.hasOwnProperty(c)) {
    o[c]++;
  }
})
console.log(Math.sqrt(Math.pow(o.N - o.S, 2) + Math.pow(o.E - o.W, 2)));