1 #include <stdio.h>
 2 #include <string.h>
 3 int main(void)
 4 {
 5     char string_change[5005],string_source[5005];
 6     while (~scanf("%s %s", string_source, string_change))
 7     {
 8         int plus_source, sub_source, plus_change, sub_change;
 9         plus_source = sub_source = plus_change = sub_change = 0;
10         int len_source = strlen(string_source), len_change =
11             strlen(string_change);
12         for (int i = 0; i < len_source; i++)
13         {
14             if (string_source[i] == '+')
15                 plus_source++;
16             else
17                 sub_source++;
18         }
19         for (int i = 0; i < len_change; i++)
20         {
21             if (string_change[i] == '+')
22                 plus_change++;
23             else
24                 sub_change++;
25         }
26         int count = 0;
27         if (plus_source == plus_change&&
28             sub_source == sub_change)
29         {
30             for (int i = 0; i < len_change; i++)
31             {
32                 if (string_source[i] != string_change[i])
33                 {
34                     for (int j = i + 1; j < len_change; j++)
35                     {
36                         if (string_change[i] != string_change[j])
37                         {
38                             count += (j - i);
39                             string_change[j] = string_change[i];
40                             break;
41                         }
42                     }
43                 }
44             }
45             printf("%d\n", count);
46         }
47         else
48             printf("-1\n");
49     }
50     return 0;
51 }