A43 - Travel 3
https://atcoder.jp/contests/tessoku-book/tasks/tessoku_book_aq
提出
code: python
n, l = map(int, input().split())
ab =
list(input().split()) for _ in range(n)
ans = 0
for a, b in ab:
if b == "E":
ans = max(l-int(a), ans)
else:
ans = max(int(a), ans)
print(ans)