a,b = list(map(int,input().split(" ")))
s = input()
postal_code_len = a+b+1

num_list = list(map(str, range(0,10)))

flag = True
print([c in num_list for c in list(s[:a]+s[a+1:]) ])
if s[a] == "-" and all([ c in num_list for c in list(s[:a]+s[a+1:]) ]):
    print("Yes")
else:
    print("No")