#define _CRT_SECURE_NO_WARNINGS #include<iostream> #include<cstdio> #include<cstdlib> #include<string> #include<algorithm> #include<cmath> #include<queue> #include<vector> #include<stack> using namespace std; #define REP(i,n) for(int i=0;(i)<(n);(i)++) #define ll long long int main() { pair<int,char> a[3]; REP(i, 3) { cin >> a[i].first; a[i].second = 'A' + i; } sort(a, a + 3); for(int i=2;i>=0;i--) { cout << a[i].second << endl; } return 0; }