Submission #162147

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Source Code Expand

#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;
typedef long long ll;

int main()
{
  string str;
  cin >> str;
  if(str == "a") cout << -1 << endl;
  else cout << "a" << endl;

	return 0;
}

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