import std.stdio, std.string, std.conv, std.algorithm, std.numeric;
import std.range, std.array, std.math, std.typecons, std.container, core.bitop;

alias hw = Tuple!(int, "h", int, "w", char, "abc");

void main() {
    auto a = new hw[](3);

    foreach (i ; 0 .. 3) {
        int hi, wi;
        scan(hi, wi);
        a[i] = hw(hi, wi, ('A' + i).to!char);
    }

    alias cmp = (x, y) => (x.h > y.h || (x.h == y.h && x.w < y.w));

    a.sort!(cmp);

    foreach (ai ; a) {
        writeln(ai.abc);
    }
}



void scan(T...)(ref T args) {
    string[] line = readln.split;
    foreach (ref arg; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}



void fillAll(R, T)(ref R arr, T value) {
    static if (is(typeof(arr[] = value))) {
        arr[] = value;
    }
    else {
        foreach (ref e; arr) {
            fillAll(e, value);
        }
    }
}