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 PyPy3 (2.4.0) (judge verdict: Accepted)

A,B = list(map(int,input().split()))

S = str(input())
num = [i  for i in range(10)]
H = '-'
fr = 0
count = 0
if S[A] != H:
    fr += 1
for i in range(len(S)):
    for j in num:
        if i == A:
            pass
        else:
            if S[i] == str(j):
                count += 1
if count == A + B and fr == 0:
    print("Yes")
else:
    print("No")