#include <bits/stdc++.h> using namespace std; int a[100]; int main(){ int n,A,B,C; cin>>n; for(int i=0;i<n;i++){ cin>>a[i]; if(a[i]==1) A++; else if(a[i]==2) B++; else if(a[i]==3) C++; else cout<<"NONE"; } if(A>B&&A>C) cout<<"A"; else if(B>A&&B>C) cout<<"B"; else cout<<"C"; return 0; }