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();
		char[] s = sc.next().toCharArray();
		boolean t = true;
		for (int i = 0; i < s.length; i++) {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		}
		if (t) {
			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();
		char[] s = sc.next().toCharArray();
		boolean t = true;
		for (int i = 0; i < s.length; i++) {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		}
		if (t) {
			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();
		char[] s = sc.next().toCharArray();
		boolean t = true;
		for (int i = 0; i < s.length; i++) {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		}
		if (t) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		char[] s = sc.next().toCharArray();
		boolean t = true;
		for (int i = 0; i < s.length; i++) {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		}
		if (t) {
			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 char[] s = sc.next().toCharArray(); s sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc boolean t = true; t true for (int i = 0; i < s.length; i++) {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		} int i = 0; int i = 0; i 0 i < s.length i s.length s s.length i++ i++ i {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		} {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		} if (a != i && s[i] == '-') {
				t = false;
				break;
			} a != i && s[i] == '-' a != i a i s[i] == '-' s[i] s i '-' {
				t = false;
				break;
			} t = false t false break; if (a == i && s[i] != '-') {
				t = false;
				break;
			} a == i && s[i] != '-' a == i a i s[i] != '-' s[i] s i '-' {
				t = false;
				break;
			} t = false t false break; if (t) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} t {
			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();
		char[] s = sc.next().toCharArray();
		boolean t = true;
		for (int i = 0; i < s.length; i++) {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		}
		if (t) {
			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();
		char[] s = sc.next().toCharArray();
		boolean t = true;
		for (int i = 0; i < s.length; i++) {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		}
		if (t) {
			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();
		char[] s = sc.next().toCharArray();
		boolean t = true;
		for (int i = 0; i < s.length; i++) {
			if (a != i && s[i] == '-') {
				t = false;
				break;
			}
			if (a == i && s[i] != '-') {
				t = false;
				break;
			}
		}
		if (t) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}
