包对的

#include<bits/stdc++.h>
using namespace std;

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