Submission #3960221

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Source Code Expand

// Last Change: 01/08/2019 12:56:18.
#include <algorithm>
#include <array>
#include <bitset>
#include <cmath>
#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

using namespace std;
using ll = long long;

int main() {
  string A;
  cin >> A;
  if (A[0] == 'a') {
    cout << -1;
  } else {
    cout << 'a';
  }
  cout << endl;
}

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