function comp(h1, w1, h2, w2)
    ret = false
    if(h1 < h2 or (h1 == h2 and w1 > w2)) then ret = true end
    return ret
end
ha,wa,hb,wb,hc,wc=io.read("*n", "*n", "*n", "*n", "*n", "*n")

if(comp(ha, wa, hb, wb) and comp(ha, wa, hc, wc)) then
    if(comp(hb, wb, hc, wc)) then
        print("C") print("B")
    else
        print("B") print("C")
    end
    print("A")
elseif(comp(hb, wb, ha, wa) and comp(hb, wb, hc, wc)) then
    if(comp(ha, wa, hc, wc)) then
        print("C") print("A")
    else
        print("A") print("C")
    end
    print("B")
else
    if(comp(ha, wa, hb, wb)) then
        print("B") print("A")
    else
        print("A") print("B")
    end
    print("C")
end