#pragma region おまじないα ver1 .08
//#define _CRT_SECURE_NO_WARNINGS
//#pragma warning(disable : 4996)
//using mint = modint1000000007;
#pragma region 変化しないおまじない
#include "bits/stdc++.h"
#if __has_include("atcoder/all")
#include <atcoder/all>
using namespace atcoder;
#endif
#ifdef ONLINE_JUDGE
#pragma GCC optimize("O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#endif
using namespace std;
typedef long long ll;
#define all(x) (x).begin(), (x).end()  // sortなどの引数を省略
#define max3(x, y, z) max(x, max(y, z))  // 3変数min
#define min3(x, y, z) min(x, min(y, z))  // 3変数max
#define chmin(m, v) m = min((m), (v))  //最小値を更新
#define chmax(m, v) m = max((m), (v))  //最大値を更新
#define rep(i, n) repi(i, 0, n)  // 0-N rep
#define reps(i, n) repi(i, 1, n + 1)  // 1-N
#define repi(i, a, b) for (ll i = ll(a); i < ll(b); i++)  // a-b
#define prif(x) if (x) {cout << "Yes";} else {cout << "No";}
#define PR pair<ll, ll>  // typedefだと予測が効かないっぽい？
#ifdef _MSC_FULL_VER  //手元なら
#define dout cout
#else
#define dout if (false) cout
#endif
double dist(double x1, double y1, double x2, double y2) {return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));}
ll idist(ll x1, ll y1, ll x2, ll y2) {return (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);}
ll digitsum(ll N) {while (N >= 10) {int tmp = 0;while (N > 0) {tmp += (N % 10); N /= 10;}N = tmp;}return N;}
struct qwqw {qwqw() {cin.tie(0);cout.tie(0);ios::sync_with_stdio(0);cout << fixed << setprecision(20);};} aaaaaaa;
#pragma endregion
#pragma endregion

signed main() {
  string s;
  cin >> s;
  rep(i, s.size()) {
    if(s[i]=='a')cout << "a";
  }
  cout << "a" << endl;

}