import java.util.Scanner;

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();
        if (s.charAt(A) == '-' && s.replace("-", "").length() == A + B) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

} import java.util.Scanner; Scanner 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();
        if (s.charAt(A) == '-' && s.replace("-", "").length() == A + B) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

} 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();
        if (s.charAt(A) == '-' && s.replace("-", "").length() == A + B) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();
        String s = sc.next();
        if (s.charAt(A) == '-' && s.replace("-", "").length() == A + B) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } 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 if (s.charAt(A) == '-' && s.replace("-", "").length() == A + B) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        } s.charAt(A) == '-' && s.replace("-", "").length() == A + B s.charAt(A) == '-' s.charAt(A) s.charAt s A '-' s.replace("-", "").length() == A + B s.replace("-", "").length() s.replace("-", "").length s.replace("-", "") s.replace s "-" "" A + B A B {
            System.out.println("Yes");
        } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
            System.out.println("No");
        } System.out.println("No") System.out.println System.out System System.out "No" 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();
        if (s.charAt(A) == '-' && s.replace("-", "").length() == A + B) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

} 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();
        if (s.charAt(A) == '-' && s.replace("-", "").length() == A + B) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

} Main
import java.util.Scanner;

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();
        if (s.charAt(A) == '-' && s.replace("-", "").length() == A + B) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

}