Problem:
Score : 200 points

Problem Statement

The postal code in Atcoder Kingdom is A+B+1 characters long, its (A+1)-th character is a hyphen -, and the other characters are digits from 0 through 9.

You are given a string S. Determine whether it follows the postal code format in Atcoder Kingdom.

Constraints

1≤A,B≤5

|S|=A+B+1

S consists of - and digits from 0 through 9.

Input

Input is given from Standard Input in the following format:

A B
S

Output

Print Yes if S follows the postal code format in AtCoder Kingdom; print No otherwise.

Sample Input 1

3 4
269-6650

Sample Output 1

Yes

The (A+1)-th character of S is -, and the other characters are digits from 0 through 9, so it follows the format.

Sample Input 2

1 1
---

Sample Output 2

No

S contains unnecessary -s other than the (A+1)-th character, so it does not follow the format.

Sample Input 3

1 2
7444

Sample Output 3

No

Solution in Python (3.4.3) (judge verdict: Runtime Error)

def number(c):
    c = str(c)
    ans = 0
    s = "0123456789"
    for i in range(10):
        if c == s[i]:ans = 1
    return ans

A,B = map(int,input().split())
S = input()
flag = 1
for i in range(A):
    if(number(S[i]) != 1):flag = 0
if S[A] != "-":flag = 0
for j in range(B):
    if(number(S[A+1+i]) != 1):flag = 0
if flag:print("Yes")
else:print("No")