dic = {0 : "A", 1 : "B", 2 : "C"}
dicH = {}
dicW = {}
lstH = []
lstW = []
for i in range(3):
    h,w = map(int, input().split())
    if (dic[i] in dicH) == False:
        dicH[h] = dic[i]
        dicH[dic[i]] = h
    lstH.append(h)
    dicW[dic[i]] = w
    lstW.append(w)

if lstH[0] == lstH[1]:
    if dicW["A"] < dicW["B"]:
        if dicH["C"] > dicH["A"]:
            print("C\nA\nB")
    else:
        if dicH["C"] > dicH["A"]:
            print("C\nB\nA")
elif lstH[0] == lstH[2]:
    if dicW["A"] < dicW["C"]:
        if dicH["B"] > dicH["A"]:
            print("B\nA\nC")
    else:
        if dicH["B"] > dicH["A"]:
            print("B\nC\nA")
elif lstH[1] == lstH[2]:
    if dicW["B"] < dicW["C"]:
        if dicH["A"] > dicH["B"]:
            print("A\nB\nC")
    else:
        if dicH["A"] > dicH["B"]:
            print("A\nC\nB")
elif lstH[0] == lstH[1] and lstH[1] == lstH[2]:
    lstW.sort()
    print(dicH[lstH[0]] + "\n" + dicH[lstH[1]] + "\n" + dicH[lstH[2]])
else:
    lstH.sort()
    print(dicH[lstH[2]] + "\n" + dicH[lstH[1]] + "\n" + dicH[lstH[0]])