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: Wrong Answer)

A,B=map(int,input().split())
S=str(input())
T=sorted(S[:])
p=0
if (A+B+1)!=len(S):
  print("No")
else:
  if S[A]=="-":
    for i in range(1,len(S)):
      if 48<=ord(T[i])<=57:
        #print(ord(T[i]))
        p=1
      else:
        p=0
    #print(p)
    print("Yes" if p!=0 else "No")
  else:
    print("No")