解

#include<iostream>
using namespace std;

int main() {
int a, b, c;
cin >> a >> b >> c;
if(a + b > c && a + c > b && b + c > a) {
if(a == b && b == c) {
cout << "aaa";
}
else if(a == b || b == c || a == c) {
cout << "aab";
}
else {
cout << "abc";
}
}else {
cout << "error";
}
return 0;
}