n = [str(i) for i in range(10)]
flag = False
for i in range(A):
    if S[i] not in n:
        flag = True
        
if S[A] != '-':
    flag = True
    
for i in range(A+1, A+B+1):
    if S[i] not in n:
        flag = True
        
if flag:
    print('No')
else:
    print('Yes')