import std.experimental.all;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

void calc(int[][] xs) {
    xs.sort!((a, b) => a[0] == b[0] ? a[1] < b[1] : a[0] > b[0]);
    foreach (x; xs) {
        char c = to!char(x[2] + 'A');
        writeln(c);
    }
}

void main() {
    auto a = readints;
    auto b = readints;
    auto c = readints;
    calc([a ~= 0, b ~= 1, c ~= 2]);
}