let n = 0, e = 0;

require("fs").readFileSync("/dev/stdin", "utf8").split("").forEach(c => {
  switch (c) {
    case 'N': n++; break;
    case 'S': n--; break;
    case 'E': e++; break;
    case 'W': e--; break;
  }
});
console.log(Math.sqrt(n*n + e*e));