Submission #1367887

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define all(c) (c).begin(),(c).end()
#define rep(i,n) for(int i=0; i<(int)(n); i++)
#define iter(c) __typeof((c).begin())
#define tr(it,c) for(iter(c) it=(c).begin(); it!=(c).end(); it++)
#define pb(a) push_back(a)
#define mp(a,b) make_pair(a,b)
#define pr(a) cout << (a) << endl
typedef long long ll;
typedef pair<int,int> P;
const int MAX=1000000000;
int dx[4]={-1,0,1,0},dy[4]={0,-1,0,1};
 
int main() {
  string s;
  cin >> s;
  if(s=="a") pr(-1);
  else pr("a");
  return 0;
}

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