hls=[]
hls.append(int(input()))
hls.append(int(input()))
hls.append(int(input()))
ctls=[1]*3

for j in range(3):
    for i in range(3):
        if hls[j]<hls[i]:
            ctls[j]+=1

if ctls.index(1)==0:
    print("A")
    if ctls.index(2)==1:
        print("B")
        print("C")
    else:
        print("C")
        print("B")
    
elif ctls.index(1)==1:
    print("B")
    if ctls.index(2)==0:
        print("A")
        print("C")
    else:
        print("C")
        print("A")

elif ctls.index(1)==2:
    print("C")
    if ctls.index(2)==0:
        print("A")
        print("B")
    else:
        print("B")
        print("A")