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();
		sc.close();
		
		int p;
		for(int i=0; i<A; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		if('-' != S.charAt(A)) {
			System.out.println("No");
			return;
		}
		
		for(int i=A+1; i<=A+B; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		System.out.println("Yes");
	}
} 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();
		sc.close();
		
		int p;
		for(int i=0; i<A; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		if('-' != S.charAt(A)) {
			System.out.println("No");
			return;
		}
		
		for(int i=A+1; i<=A+B; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		System.out.println("Yes");
	}
} 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();
		sc.close();
		
		int p;
		for(int i=0; i<A; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		if('-' != S.charAt(A)) {
			System.out.println("No");
			return;
		}
		
		for(int i=A+1; i<=A+B; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		System.out.println("Yes");
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		String S = sc.next();
		sc.close();
		
		int p;
		for(int i=0; i<A; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		if('-' != S.charAt(A)) {
			System.out.println("No");
			return;
		}
		
		for(int i=A+1; i<=A+B; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		System.out.println("Yes");
	} 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 sc.close() sc.close sc int p; p for(int i=0; i<A; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		} int i=0; int i=0; i 0 i<A i A i++ i++ i {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		} {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		} try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			} NumberFormatException e {
				System.out.println("No");
				return;
			} System.out.println("No") System.out.println System.out System System.out "No" return; {
				p = Integer.parseInt(""+S.charAt(i));
			} p = Integer.parseInt(""+S.charAt(i)) p Integer.parseInt(""+S.charAt(i)) Integer.parseInt Integer ""+S.charAt(i) "" S.charAt(i) S.charAt S i if('-' != S.charAt(A)) {
			System.out.println("No");
			return;
		} '-' != S.charAt(A) '-' S.charAt(A) S.charAt S A {
			System.out.println("No");
			return;
		} System.out.println("No") System.out.println System.out System System.out "No" return; for(int i=A+1; i<=A+B; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		} int i=A+1; int i=A+1; i A+1 A 1 i<=A+B i A+B A B i++ i++ i {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		} {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		} try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			} NumberFormatException e {
				System.out.println("No");
				return;
			} System.out.println("No") System.out.println System.out System System.out "No" return; {
				p = Integer.parseInt(""+S.charAt(i));
			} p = Integer.parseInt(""+S.charAt(i)) p Integer.parseInt(""+S.charAt(i)) Integer.parseInt Integer ""+S.charAt(i) "" S.charAt(i) S.charAt S i System.out.println("Yes") System.out.println System.out System System.out "Yes" 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();
		sc.close();
		
		int p;
		for(int i=0; i<A; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		if('-' != S.charAt(A)) {
			System.out.println("No");
			return;
		}
		
		for(int i=A+1; i<=A+B; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		System.out.println("Yes");
	}
} 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();
		sc.close();
		
		int p;
		for(int i=0; i<A; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		if('-' != S.charAt(A)) {
			System.out.println("No");
			return;
		}
		
		for(int i=A+1; i<=A+B; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		System.out.println("Yes");
	}
} 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();
		sc.close();
		
		int p;
		for(int i=0; i<A; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		if('-' != S.charAt(A)) {
			System.out.println("No");
			return;
		}
		
		for(int i=A+1; i<=A+B; i++) {
			try {
				p = Integer.parseInt(""+S.charAt(i));
			} catch(NumberFormatException e) {
				System.out.println("No");
				return;
			}
		}
		
		System.out.println("Yes");
	}
}