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 string = sc.next();
		for(int i=0;i<A;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		
		if(string.charAt(A)  != '-') 
			{
				System.out.println("No");
				System.exit(0);
			}
		
		for(int i=A+1;i<A+B;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		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 string = sc.next();
		for(int i=0;i<A;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		
		if(string.charAt(A)  != '-') 
			{
				System.out.println("No");
				System.exit(0);
			}
		
		for(int i=A+1;i<A+B;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		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 string = sc.next();
		for(int i=0;i<A;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		
		if(string.charAt(A)  != '-') 
			{
				System.out.println("No");
				System.exit(0);
			}
		
		for(int i=A+1;i<A+B;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		System.out.println("Yes");
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(); int B = sc.nextInt();
		String string = sc.next();
		for(int i=0;i<A;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		
		if(string.charAt(A)  != '-') 
			{
				System.out.println("No");
				System.exit(0);
			}
		
		for(int i=A+1;i<A+B;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		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 string = sc.next(); string sc.next() sc.next sc for(int i=0;i<A;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				} int i=0; int i=0; i 0 i<A i A i++ i++ i if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				} if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				} '0' > string.charAt(i)  || '9' < string.charAt(i) '0' > string.charAt(i) '0' string.charAt(i) string.charAt string i '9' < string.charAt(i) '9' string.charAt(i) string.charAt string i {
					System.out.println("No"); 
					System.exit(0);
				} System.out.println("No") System.out.println System.out System System.out "No" System.exit(0) System.exit System 0 if(string.charAt(A)  != '-') 
			{
				System.out.println("No");
				System.exit(0);
			} string.charAt(A)  != '-' string.charAt(A) string.charAt string A '-' {
				System.out.println("No");
				System.exit(0);
			} System.out.println("No") System.out.println System.out System System.out "No" System.exit(0) System.exit System 0 for(int i=A+1;i<A+B;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				} int i=A+1; int i=A+1; i A+1 A 1 i<A+B i A+B A B i++ i++ i if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				} if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				} '0' > string.charAt(i)  || '9' < string.charAt(i) '0' > string.charAt(i) '0' string.charAt(i) string.charAt string i '9' < string.charAt(i) '9' string.charAt(i) string.charAt string i {
					System.out.println("No"); 
					System.exit(0);
				} System.out.println("No") System.out.println System.out System System.out "No" System.exit(0) System.exit System 0 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 string = sc.next();
		for(int i=0;i<A;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		
		if(string.charAt(A)  != '-') 
			{
				System.out.println("No");
				System.exit(0);
			}
		
		for(int i=A+1;i<A+B;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		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 string = sc.next();
		for(int i=0;i<A;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		
		if(string.charAt(A)  != '-') 
			{
				System.out.println("No");
				System.exit(0);
			}
		
		for(int i=A+1;i<A+B;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		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 string = sc.next();
		for(int i=0;i<A;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		
		if(string.charAt(A)  != '-') 
			{
				System.out.println("No");
				System.exit(0);
			}
		
		for(int i=A+1;i<A+B;i++) 
			if('0' > string.charAt(i)  || '9' < string.charAt(i)) 
				{
					System.out.println("No"); 
					System.exit(0);
				}
		System.out.println("Yes");
	}

}
