#include<bits/stdc++.h>
using namespace std;
int a[3],b[3];
int main(){
    cin>>a[0]>>a[1]>>a[2];
    b[0]=a[0];b[1]=a[1];b[2]=a[2];
    sort(b,b+3);
    if(b[2]==a[0]) cout<<"A"<<endl;
    else if(b[2]==a[1]) cout<<"B"<<endl;
    else if(b[2]==a[2]) cout<<"C"<<endl;
    if(b[1]==a[0]) cout<<"A"<<endl;
    else if(b[1]==a[1]) cout<<"B"<<endl;
    else if(b[1]==a[2]) cout<<"C"<<endl;
    if(b[0]==a[0]) cout<<"A"<<endl;
    else if(b[0]==a[1]) cout<<"B"<<endl;
    else if(b[0]==a[2]) cout<<"C"<<endl;
    return 0;
}