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().split("");
		if (S.length != A + B + 1) {
			System.out.println("No");
			return;
		}
		for (int i = 0; i < A; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		}
		if (!(S[A].equals("-"))) {
			System.out.println("No");
			return;
		}
		for (int i = A + 1; i < A + B + 1; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception 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().split("");
		if (S.length != A + B + 1) {
			System.out.println("No");
			return;
		}
		for (int i = 0; i < A; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		}
		if (!(S[A].equals("-"))) {
			System.out.println("No");
			return;
		}
		for (int i = A + 1; i < A + B + 1; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception 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().split("");
		if (S.length != A + B + 1) {
			System.out.println("No");
			return;
		}
		for (int i = 0; i < A; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		}
		if (!(S[A].equals("-"))) {
			System.out.println("No");
			return;
		}
		for (int i = A + 1; i < A + B + 1; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception 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().split("");
		if (S.length != A + B + 1) {
			System.out.println("No");
			return;
		}
		for (int i = 0; i < A; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		}
		if (!(S[A].equals("-"))) {
			System.out.println("No");
			return;
		}
		for (int i = A + 1; i < A + B + 1; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception 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().split(""); S sc.next().split("") sc.next().split sc.next() sc.next sc "" if (S.length != A + B + 1) {
			System.out.println("No");
			return;
		} S.length != A + B + 1 S.length S S.length 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++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		} int i = 0; int i = 0; i 0 i < A i A i++ i++ i {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		} {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		} try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			} catch (Exception e) {
				System.out.println("No");
				return;
			} Exception e {
				System.out.println("No");
				return;
			} System.out.println("No") System.out.println System.out System System.out "No" return; {
				Integer.parseInt(S[i]);
			} Integer.parseInt(S[i]) Integer.parseInt Integer S[i] S i if (!(S[A].equals("-"))) {
			System.out.println("No");
			return;
		} !(S[A].equals("-")) (S[A].equals("-")) S[A].equals S[A] 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 + 1; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		} 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 {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		} {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		} try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			} catch (Exception e) {
				System.out.println("No");
				return;
			} Exception e {
				System.out.println("No");
				return;
			} System.out.println("No") System.out.println System.out System System.out "No" return; {
				Integer.parseInt(S[i]);
			} Integer.parseInt(S[i]) Integer.parseInt Integer S[i] 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().split("");
		if (S.length != A + B + 1) {
			System.out.println("No");
			return;
		}
		for (int i = 0; i < A; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		}
		if (!(S[A].equals("-"))) {
			System.out.println("No");
			return;
		}
		for (int i = A + 1; i < A + B + 1; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception 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().split("");
		if (S.length != A + B + 1) {
			System.out.println("No");
			return;
		}
		for (int i = 0; i < A; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		}
		if (!(S[A].equals("-"))) {
			System.out.println("No");
			return;
		}
		for (int i = A + 1; i < A + B + 1; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception 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().split("");
		if (S.length != A + B + 1) {
			System.out.println("No");
			return;
		}
		for (int i = 0; i < A; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		}
		if (!(S[A].equals("-"))) {
			System.out.println("No");
			return;
		}
		for (int i = A + 1; i < A + B + 1; i++) {
			try {
				Integer.parseInt(S[i]);
			} catch (Exception e) {
				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
	}

}