AtCoder ABC371の振り返り

AtCoderのABC371の振り返りです。
この回も1問だけでした。残念です。

atcoder.jp

A - Jiro

S = list(map(str, input().split()))
A = [0, 0, 0]

for i in range(len(S)):
    if i == 0 and S[0] == "<":
        A[1] += 1
    elif i == 0 and S[0] == ">":
        A[0] += 1
    if i == 1 and S[1] == "<":
        A[2] += 1
    elif i == 1 and S[1] == ">":
        A[0] += 1
    if i == 2 and S[2] == "<":
        A[2] += 1
    elif i == 2 and S[2] == ">":
        A[1] += 1


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