import sequtils,strutils,algorithm

var
    A = newSeq[tuple[a : char, b : int]](3)
    i : int

for c in 'A'..'C':
    A[i].a = c
    A[i].b = stdin.readline.parseInt
    i += 1

A = A.sortedByIt(-it.b)
for a in A:
    echo a.a