Python3 代码

s, s1, s2 = input().split(",")

if len(s) < len(s1) or len(s) < len(s2):
    print (-1)
else:
    l = -1
    for i in range (len(s) - len (s1) + 1):
        if s[i: i + len(s1)] == s1:
            l = i + len(s1)
            break
    r = -1
    for j in range (len(s), len(s2) - 1, -1):
        if s[j - len(s2): j] == s2:
            r = j - len(s2)
            break

    if l > -1 and r > -1 and l <= r:
        print (r - l)
    else:
        print (-1)