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();
    char p[] = s.toCharArray();
    int flag = 0;
    for(int i = 0;i < a;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(p[a] != '-'){
      flag = 1;
    }
    for(int i = a + 1;i <= a + b;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(flag == 0){
      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();
    char p[] = s.toCharArray();
    int flag = 0;
    for(int i = 0;i < a;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(p[a] != '-'){
      flag = 1;
    }
    for(int i = a + 1;i <= a + b;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(flag == 0){
      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();
    char p[] = s.toCharArray();
    int flag = 0;
    for(int i = 0;i < a;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(p[a] != '-'){
      flag = 1;
    }
    for(int i = a + 1;i <= a + b;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(flag == 0){
      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();
    char p[] = s.toCharArray();
    int flag = 0;
    for(int i = 0;i < a;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(p[a] != '-'){
      flag = 1;
    }
    for(int i = a + 1;i <= a + b;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(flag == 0){
      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 char p[] = s.toCharArray(); p s.toCharArray() s.toCharArray s int flag = 0; flag 0 for(int i = 0;i < a;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    } int i = 0; int i = 0; i 0 i < a i a i++ i++ i {
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    } {
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    } if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      } p[i] < '0' || p[i] > '9' p[i] < '0' p[i] p i '0' p[i] > '9' p[i] p i '9' {
        flag = 1;
      } flag = 1 flag 1 if(p[a] != '-'){
      flag = 1;
    } p[a] != '-' p[a] p a '-' {
      flag = 1;
    } flag = 1 flag 1 for(int i = a + 1;i <= a + b;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    } 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(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    } {
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    } if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      } p[i] < '0' || p[i] > '9' p[i] < '0' p[i] p i '0' p[i] > '9' p[i] p i '9' {
        flag = 1;
      } flag = 1 flag 1 if(flag == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    } flag == 0 flag 0 {
      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();
    char p[] = s.toCharArray();
    int flag = 0;
    for(int i = 0;i < a;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(p[a] != '-'){
      flag = 1;
    }
    for(int i = a + 1;i <= a + b;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(flag == 0){
      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();
    char p[] = s.toCharArray();
    int flag = 0;
    for(int i = 0;i < a;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(p[a] != '-'){
      flag = 1;
    }
    for(int i = a + 1;i <= a + b;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(flag == 0){
      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();
    char p[] = s.toCharArray();
    int flag = 0;
    for(int i = 0;i < a;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(p[a] != '-'){
      flag = 1;
    }
    for(int i = a + 1;i <= a + b;i++){
      if(p[i] < '0' || p[i] > '9'){
        flag = 1;
      }
    }
    if(flag == 0){
      System.out.println("Yes");
    }else{
      System.out.println("No");
    }
  }
}