s = list(input())                                                                                                          
t = list(input())                                                                                                          
                                                                                                                           
if len(t) == 1 and ''.join(t) in ''.join(s):                                                                               
    print(-1)                                                                                                              
    exit()                                                                                                                 
                                                                                                                           
c = 0                                                                                                                      
while c < len(s):                                                                                                          
    if s[c:c+len(t)] == t:                                                                                                 
        s.insert(c+len(t)-1, '.')                                                                                          
    c += 1                                                                                                                 
                                                                                                                           
print(''.join(s).count('.'))