#include<bits/stdc++.h>
#define ll long long
#define rg register
#define pb push_back
#define ppb pop_back
#define ld long double
#define gc getchar
#define pc putchar
#define fo(i,l,r) for(rg int i=(l);i<=(r);++i)
#define rp(i,r,l) for(rg int i=(r);i>=(l);--i)

using namespace std;


int main() {
//	freopen("","r",stdin);
//	freopen("","w",stdout);
	puts("kecheng"); 
}