#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <float.h>
#include <math.h>
#include <string.h>
#define EPS FLT_EPSILON
#define ios_no_sync do{ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);}while(0)
//#define DEBUG
#ifdef DEBUG
    #define DBG(x) do{cout <<__FUNCTION__<< ":" << __LINE__ << ": " << #x << " = " << (x) << endl;}while(0)
#else
    #define DBG(x) do{}while(0)
#endif
#define mset(a,b) memset(a,b,sizeof(a))
using namespace std;
typedef long long ll;
typedef long double ld;
template<typename T>
T GCD(T a, T b) {
    return b==0?a:GCD(b,a%b);
}
const int INF = 0x3f3f3f3f;
const double PI=acos(-1.0);

int main() {
    ios_no_sync;
    DBG(INF);
    cout << "ac" << endl;
    return 0;
}