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();

		boolean ans = true;

		for(int i=0;i<A;i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(S.charAt(A)!='-') ans = false;

		for(int i=A+1;i<S.length();i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(ans) 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();

		boolean ans = true;

		for(int i=0;i<A;i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(S.charAt(A)!='-') ans = false;

		for(int i=A+1;i<S.length();i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(ans) 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();

		boolean ans = true;

		for(int i=0;i<A;i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(S.charAt(A)!='-') ans = false;

		for(int i=A+1;i<S.length();i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(ans) 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();

		boolean ans = true;

		for(int i=0;i<A;i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(S.charAt(A)!='-') ans = false;

		for(int i=A+1;i<S.length();i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(ans) 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 boolean ans = true; ans true for(int i=0;i<A;i++) {

			if(S.charAt(i)=='-') ans = false;
		} int i=0; int i=0; i 0 i<A i A i++ i++ i {

			if(S.charAt(i)=='-') ans = false;
		} {

			if(S.charAt(i)=='-') ans = false;
		} if(S.charAt(i)=='-') ans = false; S.charAt(i)=='-' S.charAt(i) S.charAt S i '-' ans = false ans false if(S.charAt(A)!='-') ans = false; S.charAt(A)!='-' S.charAt(A) S.charAt S A '-' ans = false ans false for(int i=A+1;i<S.length();i++) {

			if(S.charAt(i)=='-') ans = false;
		} int i=A+1; int i=A+1; i A+1 A 1 i<S.length() i S.length() S.length S i++ i++ i {

			if(S.charAt(i)=='-') ans = false;
		} {

			if(S.charAt(i)=='-') ans = false;
		} if(S.charAt(i)=='-') ans = false; S.charAt(i)=='-' S.charAt(i) S.charAt S i '-' ans = false ans false if(ans) System.out.println("Yes");

		else System.out.println("No"); ans 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" 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();

		boolean ans = true;

		for(int i=0;i<A;i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(S.charAt(A)!='-') ans = false;

		for(int i=A+1;i<S.length();i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(ans) 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();

		boolean ans = true;

		for(int i=0;i<A;i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(S.charAt(A)!='-') ans = false;

		for(int i=A+1;i<S.length();i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(ans) 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();

		boolean ans = true;

		for(int i=0;i<A;i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(S.charAt(A)!='-') ans = false;

		for(int i=A+1;i<S.length();i++) {

			if(S.charAt(i)=='-') ans = false;
		}

		if(ans) System.out.println("Yes");

		else System.out.println("No");
	}

}
