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