import java.util.*;

public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        String pattern = "^[0-9]{" + a + "}-[0-9]{" + b + "}$";
        if(s.matches(pattern))System.out.println("Yes");
        else System.out.println("No");
        sc.close();
    }

} import java.util.*; util.* java public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        String pattern = "^[0-9]{" + a + "}-[0-9]{" + b + "}$";
        if(s.matches(pattern))System.out.println("Yes");
        else System.out.println("No");
        sc.close();
    }

} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        String pattern = "^[0-9]{" + a + "}-[0-9]{" + b + "}$";
        if(s.matches(pattern))System.out.println("Yes");
        else System.out.println("No");
        sc.close();
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        String pattern = "^[0-9]{" + a + "}-[0-9]{" + b + "}$";
        if(s.matches(pattern))System.out.println("Yes");
        else System.out.println("No");
        sc.close();
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc String s = sc.next(); s sc.next() sc.next sc String pattern = "^[0-9]{" + a + "}-[0-9]{" + b + "}$"; pattern "^[0-9]{" + a + "}-[0-9]{" + b + "}$" b "}-[0-9]{" "^[0-9]{" + a + "}-[0-9]{" + b + "}$" "^[0-9]{" a "}-[0-9]{" b "}$" if(s.matches(pattern))System.out.println("Yes");
        else System.out.println("No"); s.matches(pattern) s.matches s pattern System.out.println("Yes") System.out.println System.out System System.out "Yes" System.out.println("No") System.out.println System.out System System.out "No" sc.close() sc.close sc String[] args args public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        String pattern = "^[0-9]{" + a + "}-[0-9]{" + b + "}$";
        if(s.matches(pattern))System.out.println("Yes");
        else System.out.println("No");
        sc.close();
    }

} public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        String pattern = "^[0-9]{" + a + "}-[0-9]{" + b + "}$";
        if(s.matches(pattern))System.out.println("Yes");
        else System.out.println("No");
        sc.close();
    }

} Main
import java.util.*;

public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        String s = sc.next();
        String pattern = "^[0-9]{" + a + "}-[0-9]{" + b + "}$";
        if(s.matches(pattern))System.out.println("Yes");
        else System.out.println("No");
        sc.close();
    }

}