#include<bits/stdc++.h> using namespace std; int z[110]; int main(){ int n,a=0,b=0,c=0;cin>>n; for(int i=1;i<=n;i++){ cin>>z[i]; if(z[i]==1)a++; if(z[i]==2)b++; if(z[i]==3)c++; } if(a==b or b==c or c==a)cout<<"NONE"; if(a>b and a>c)cout<<"A"; if(b>a and b>c)cout<<"B"; if(c>a and c>b)cout<<"C"; return 0; }