题解

#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 and b==c){
			cout<<"aaa";
		}else if (a==b or a==c or b==c){
			cout<<"aab";
		}else{
			cout<<"abc";
		}
	}else{
		cout<<"error";
	}
	return 0;
}