CF271D Good Substrings

You've got string $ s $ , consisting of small English letters. Some of the English letters are good, the rest are bad. A substring $ s[l...r] $ ( $ 1

The first line of the input is the non-empty string $ s $ , consisting of small English letters, the string's length is at most $ 1500 $ characters. The second line of the input is the string of characters "0" and "1", the length is exactly 26 characters. If the $ i $ -th character of this string equals "1", then the $ i $ -th English letter is good, otherwise it's bad. That is, the first character of this string corresponds to letter "a", the second one corresponds to letter "b" and so on. The third line of the input consists a single integer $ k $ ( $ 0

Print a single integer — the number of distinct good substrings of string $ s $ .

In the first example there are following good substrings: "a", "ab", "b", "ba", "bab". In the second example there are following good substrings: "a", "aa", "ac", "b", "ba", "c", "ca", "cb".