Given are two strings s and t consisting of lowercase English letters. Determine if there exists an integer i satisfying the following condition, and find the minimum such i if it exists.

* Let s' be the concatenation of 10^{100} copies of s. t is a subsequence of the string {s'}_1{s'}_2\ldots{s'}_i (the first i characters in s').

Constraints

* 1 \leq |s| \leq 10^5
* 1 \leq |t| \leq 10^5
* s and t consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:


s
t


Output

If there exists an integer i satisfying the following condition, print the minimum such i; otherwise, print `-1`.

Examples

Input

contest
son


Output

10


Input

contest
programming


Output

-1


Input

contest
sentence


Output

33
from collections import defaultdict
import bisect

S = input()
T = input()
d = defaultdict(list)
for i, s in enumerate(S):
    d[s].append(i)

x = -1
cnt = 0

for t in T:
    if len(d[t]) == 0:
        print(-1)
        exit()
    y = bisect.bisect_right(d[t], x)
    if y == len(d[t]):
        cnt += 1
        x = d[t][0]
    else:
        x = d[t][y]

ans = len(S) * cnt + x + 1
print(ans)