tj

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