#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int,int> PII;
typedef pair<ll,ll> PLL;
#define endl '\n'
#define debug(x) cout<<#x<<": "<<x<<endl
#define lowbit(x) (x&-x)
#define gcd __gcd
#define i128 __int128
#define rep(i, a, b) for(ll i = (a); i <= (b); i++)
#define per(i, a, b) for(ll i = (a); i >= (b); i--)
const int N=3e6+10,M=1e3+10;
const ll mod=1e9+7;
const ld eps=1e-12;
const ld pi=3.14159265358979;
mt19937_64 rnd(chrono::steady_clock::now().time_since_epoch().count());
#define poly vector<int>
#define fi first
#define se second


void solve()
{
    cout << "kecheng";
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0),cout.tie(0);

	int T=1;
//    cin>>T;
	while(T--)
	{
		solve();
	}
	return 0;
}