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();
		boolean flag = true;
		if(s.length() != a + b + 1) {
			System.out.println("No");
			return;
		}
		for(int i = 0; i < a; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		}
		if(s.charAt(a) != '-') {
			flag = false;
		}
		for(int i = a + 1; i < a + b + 1; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		}
		if(flag) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} 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();
		boolean flag = true;
		if(s.length() != a + b + 1) {
			System.out.println("No");
			return;
		}
		for(int i = 0; i < a; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		}
		if(s.charAt(a) != '-') {
			flag = false;
		}
		for(int i = a + 1; i < a + b + 1; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		}
		if(flag) {
			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 flag = true;
		if(s.length() != a + b + 1) {
			System.out.println("No");
			return;
		}
		for(int i = 0; i < a; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		}
		if(s.charAt(a) != '-') {
			flag = false;
		}
		for(int i = a + 1; i < a + b + 1; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		}
		if(flag) {
			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 flag = true;
		if(s.length() != a + b + 1) {
			System.out.println("No");
			return;
		}
		for(int i = 0; i < a; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		}
		if(s.charAt(a) != '-') {
			flag = false;
		}
		for(int i = a + 1; i < a + b + 1; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		}
		if(flag) {
			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 flag = true; flag true if(s.length() != a + b + 1) {
			System.out.println("No");
			return;
		} s.length() != a + b + 1 s.length() s.length s a + b + 1 a + b + 1 a b 1 {
			System.out.println("No");
			return;
		} System.out.println("No") System.out.println System.out System System.out "No" return; for(int i = 0; i < a; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		} int i = 0; int i = 0; i 0 i < a i a i++ i++ i {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		} {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		} if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			} s.charAt(i) < '0' || s.charAt(i) > '9' s.charAt(i) < '0' s.charAt(i) s.charAt s i '0' s.charAt(i) > '9' s.charAt(i) s.charAt s i '9' {
				flag = false;
				break;
			} flag = false flag false break; if(s.charAt(a) != '-') {
			flag = false;
		} s.charAt(a) != '-' s.charAt(a) s.charAt s a '-' {
			flag = false;
		} flag = false flag false for(int i = a + 1; i < a + b + 1; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		} int i = a + 1; int i = a + 1; i a + 1 a 1 i < a + b + 1 i a + b + 1 a + b + 1 a b 1 i++ i++ i {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		} {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		} if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			} s.charAt(i) < '0' || s.charAt(i) > '9' s.charAt(i) < '0' s.charAt(i) s.charAt s i '0' s.charAt(i) > '9' s.charAt(i) s.charAt s i '9' {
				flag = false;
			} flag = false flag false if(flag) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} flag {
			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();
		boolean flag = true;
		if(s.length() != a + b + 1) {
			System.out.println("No");
			return;
		}
		for(int i = 0; i < a; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		}
		if(s.charAt(a) != '-') {
			flag = false;
		}
		for(int i = a + 1; i < a + b + 1; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		}
		if(flag) {
			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 flag = true;
		if(s.length() != a + b + 1) {
			System.out.println("No");
			return;
		}
		for(int i = 0; i < a; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		}
		if(s.charAt(a) != '-') {
			flag = false;
		}
		for(int i = a + 1; i < a + b + 1; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		}
		if(flag) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} 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();
		boolean flag = true;
		if(s.length() != a + b + 1) {
			System.out.println("No");
			return;
		}
		for(int i = 0; i < a; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
				break;
			}
		}
		if(s.charAt(a) != '-') {
			flag = false;
		}
		for(int i = a + 1; i < a + b + 1; i++) {
			if(s.charAt(i) < '0' || s.charAt(i) > '9') {
				flag = false;
			}
		}
		if(flag) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}