#入力を受け取る
x, y, z = map(int, input().split())
S, t = map(str, input().split())
t = int(t)
G, h = map(str, input().split())
h = int(h)

dic = dict()
dic['A'] = x
dic['B'] = y
dic['C'] = z

if S == G:
    ans = abs(t - h)
    for i in dic:
        if i == S:
            continue
        else:
            ans = min(ans, dic[S] + dic[i] - abs(t - h))
    print (ans)
    exit()

a = dic[S] - t + 1
b = t
for i in dic:
    if i != S and i != G:
        c = dic[i]
d = h - 1
e = dic[G] - h
# print (a, b, c, d, e)
ans = min(a + e, a + c + d, b + d, b + c + e)
print (ans)