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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;
import java.io.*;

public class Main {
public static void main(String args[]) {
Scanner cro=new Scanner(System.in);
BufferedReader c=new BufferedReader(new InputStreamReader(System.in));
String s,s1;
int A,B,i,C;
C=0;
A=cro.nextInt();
B=cro.nextInt();
s1=cro.nextLine();
s=cro.nextLine();
for(i=0;i<A;i++) if(Character.isDigit(s.charAt(i))) C++;
if(s.charAt(A)=='-') C++;
for(i=A+1;i<A+B+1;i++) if(Character.isDigit(s.charAt(i))) C++;
if(C==A+B+1) System.out.println("Yes");
else System.out.println("No");
}   
}