#include <bits/stdc++.h>
using namespace std;

signed main(){
    int ta=0,yo=0;
    string s;cin>>s;
    for(char p:s){
        if(p=='N')ta++;
        if(p=='E')yo++;
        if(p=='S')ta--;
        if(p=='W')yo--;
    }
    cout<<sqrt(ta*ta+yo*yo)<<endl;
}