100%AC

#include<cstdio>
int main(){
    int n;
    scanf("%d",&n);
    printf(n&1?"odd":"even");
}

#include<iostream>
using namespace std;

int main(){
    int n;
    cin>>n;
    if(n%2==0)
    {
        cout<<"even"<<endl;
    }
    else
    {
        cout<<"odd"<<endl;
    }
    return 0;
}