题解（AYWQ

水几题放松一下
不务正业

#include<bits/stdc++.h>//像啥字
using namespace std;
bool ISTRI(int q, int w, int e) {
	if (q + w > e && q + e > w && e + w > q)return 1;
	return 0;
}
bool ISDY(int q, int w, int e) {
	if (q == w || q == e || w == e)return 1;
	return 0;
}
bool ISDB(int q, int w, int e) {
	if (q == w && w == e)return 1;
	return 0;
}
int main() {
	int q, w, e;
	cin >> q >> w >> e;
	if (ISTRI(q, w, e)) {
		if (ISDY(q, w, e)) {
			if (ISDB(q, w, e)) {
				cout << "aaa";
			} else cout << "aab";
		} else cout << "abc";
	} else cout << "error";
	return 0;
}