ha = int(input())
hb = int(input())
hc = int(input())
H = [ha, hb, hc]
mx = max(H)
mn = min(h)

if mx==ha:
    mx_c = 'A'
elif mx==hb:
    mx_c = 'B'
else:
    mx_c = 'C'

if mn==ha:
    mn_x = 'A'
elif mn==hb:
    mn_c = 'B'
else:
    mn_c = 'C'

print(mx_c)
if mx_c!='A' and mn_c!='A':
    print('A')
elif mx_c!='B' and mn_c!='B':
    print('B')
else:
    print('C')
print(mn_c)