#include<bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a==0&&b==1){ cout<<"aa1"; } else if(a==1&&b==2) cout<<"aa1"; else if(a==2&&b==1) cout<<"bb2"; else if(a==1&&b==0) cout<<"bb2"; else if(a==0&&b==2) cout<<"bb2"; else if(a==2&&b==1) cout<<"aa1"; return 0; }