Submission #1161189

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Source Code Expand

#define MYDEBUG
#include <iostream>
#include <vector>
#include <chrono>
#include <random>
#include <algorithm>

#ifdef MYDEBUG
#define debug(x) cout<<#x<<": "<<x<<endl
#else
#define debug(x)
#endif
#define ll long long
#define ull unsigned long long
#define eps 1e-14
using namespace std;

template<typename T>
ostream& operator<<(ostream& out, const vector<T>& v) {
	out << "[";
	size_t last = v.size() - 1;
	for (size_t i = 0; i < v.size(); ++i) {
		out << v[i];
		if (i != last)
			out << ",";
	}
	out << "]";
	return out;
}

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

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