rt，提交记录，WA on #9,11~12,14~15,17~18,20

#include<bits/stdc++.h>
using namespace std;
int main(){
    string s,r="\\r",n="\\n";
    cin>>s;
    if(s.find(r+n)!=-1)cout<<"windows";
    else if(s.find(n)!=-1)cout<<"linux";
    else cout<<"mac";
}