163_A. Substring and Subsequence
One day Polycarpus got hold of two non-empty strings s and t, consisting of lowercase Latin letters. Polycarpus is quite good with strings, so he immediately wondered, how many different pairs of "x y" are there, such that x is a substring of string s, y is a subsequence of string t, and the content of x and y is the same. Two pairs are considered different, if they contain different substrings of string s or different subsequences of string t. Read the whole statement to understand the definition of different substrings and subsequences.

The length of string s is the number of characters in it. If we denote the length of the string s as |s|, we can write the string as s = s1s2... s|s|.

A substring of s is a non-empty string x = s[a... b] = sasa + 1... sb (1 ≤ a ≤ b ≤ |s|). For example, "code" and "force" are substrings or "codeforces", while "coders" is not. Two substrings s[a... b] and s[c... d] are considered to be different if a ≠ c or b ≠ d. For example, if s="codeforces", s[2...2] and s[6...6] are different, though their content is the same.

A subsequence of s is a non-empty string y = s[p1p2... p|y|] = sp1sp2... sp|y| (1 ≤ p1 < p2 < ... < p|y| ≤ |s|). For example, "coders" is a subsequence of "codeforces". Two subsequences u = s[p1p2... p|u|] and v = s[q1q2... q|v|] are considered different if the sequences p and q are different.

Input

The input consists of two lines. The first of them contains s (1 ≤ |s| ≤ 5000), and the second one contains t (1 ≤ |t| ≤ 5000). Both strings consist of lowercase Latin letters.

Output

Print a single number — the number of different pairs "x y" such that x is a substring of string s, y is a subsequence of string t, and the content of x and y is the same. As the answer can be rather large, print it modulo 1000000007 (109 + 7).

Examples

Input

aa
aa


Output

5


Input

codeforces
forceofcode


Output

60

Note

Let's write down all pairs "x y" that form the answer in the first sample: "s[1...1] t[1]", "s[2...2] t[1]", "s[1...1] t[2]","s[2...2] t[2]", "s[1...2] t[1 2]".
```python
from sys import stdin
s=[ord(i)-97 for i in stdin.readline().strip()]
s1=[ord(i)-97 for i in stdin.readline().strip()]
n=len(s)
m=len(s1)
mod=1000000007
dp=[[0 for i in range(n)] for j in range(26)]
for i in range(m):
    arr=[0 for j in range(n)]
    for j in range(n):
        if s1[i]==s[j] :
            arr[j]=1
            if j>0 :
                arr[j]=(arr[j]+dp[s[j-1]][j-1])%mod
    for j in range(n):
        dp[s1[i]][j]=(arr[j] +dp[s1[i]][j]) %mod       
x=0
for i in dp:
    for j in i:
        x=(x+j)%mod
print(x)

```